* */*: Update GPL2 to GPL3.

54 files changed, 162 insertions, 322 deletions

diff --git a/contrib/chem/examples/122/README b/contrib/chem/examples/122/README
index 1b3b3c362..c31a34640 100644
--- a/contrib/chem/examples/122/README
+++ b/contrib/chem/examples/122/README
@@ -55,8 +55,8 @@ This file is part of `chem', which is part of `groff'.
 
 `groff' is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
 
 `groff' is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
@@ -64,9 +64,7 @@ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.
 
 You should have received a copy of the GNU General Public License
-along with `groff'; see the files COPYING and LICENSE in the top
-directory of the `groff' source.  If not, write to the Free Software
-Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
+along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
 ####### Emacs settings
diff --git a/contrib/chem/examples/122/ch2a_ethyl.chem b/contrib/chem/examples/122/ch2a_ethyl.chem
index bfadccc87..1484c22f0 100644
--- a/contrib/chem/examples/122/ch2a_ethyl.chem
+++ b/contrib/chem/examples/122/ch2a_ethyl.chem
@@ -17,8 +17,8 @@ ch2a_ethyl.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch2a_ethyl.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch2b_benzene.chem b/contrib/chem/examples/122/ch2b_benzene.chem
index f08d61889..565b0abca 100644
--- a/contrib/chem/examples/122/ch2b_benzene.chem
+++ b/contrib/chem/examples/122/ch2b_benzene.chem
@@ -17,8 +17,8 @@ ch2b_benzene.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch2b_benzene.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch2c_benzene_right.chem b/contrib/chem/examples/122/ch2c_benzene_right.chem
index 044ba0d6b..02659a8be 100644
--- a/contrib/chem/examples/122/ch2c_benzene_right.chem
+++ b/contrib/chem/examples/122/ch2c_benzene_right.chem
@@ -17,8 +17,8 @@ ch2c_benzene_right.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch2c_benzene_right.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4a_stick.chem b/contrib/chem/examples/122/ch4a_stick.chem
index e8668f00a..6f27e0b98 100644
--- a/contrib/chem/examples/122/ch4a_stick.chem
+++ b/contrib/chem/examples/122/ch4a_stick.chem
@@ -17,8 +17,8 @@ ch4a_stick.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4a_stick.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4b_methyl_acetate.chem b/contrib/chem/examples/122/ch4b_methyl_acetate.chem
index e48640efb..5aef328ce 100644
--- a/contrib/chem/examples/122/ch4b_methyl_acetate.chem
+++ b/contrib/chem/examples/122/ch4b_methyl_acetate.chem
@@ -17,8 +17,8 @@ ch4b_methyl_acetate.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4b_methyl_acetate.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4c_colon.chem b/contrib/chem/examples/122/ch4c_colon.chem
index 588c3cb3c..1b4273860 100644
--- a/contrib/chem/examples/122/ch4c_colon.chem
+++ b/contrib/chem/examples/122/ch4c_colon.chem
@@ -17,8 +17,8 @@ ch4c_colon.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4c_colon.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4d_HCl.H2O.chem b/contrib/chem/examples/122/ch4d_HCl.H2O.chem
index a576dcf2d..0ebc6c523 100644
--- a/contrib/chem/examples/122/ch4d_HCl.H2O.chem
+++ b/contrib/chem/examples/122/ch4d_HCl.H2O.chem
@@ -17,8 +17,8 @@ ch4d_HCl.H2O.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4d_HCl.H2O.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem b/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
index 284622311..6283c215c 100644
--- a/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
+++ b/contrib/chem/examples/122/ch4e_CaSO4.2H2O.chem
@@ -17,8 +17,8 @@ ch4e_CaSO4.2H2O.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4e_CaSO4.2H2O.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4f_C.chem b/contrib/chem/examples/122/ch4f_C.chem
index 66e460163..6ca3bbb97 100644
--- a/contrib/chem/examples/122/ch4f_C.chem
+++ b/contrib/chem/examples/122/ch4f_C.chem
@@ -17,8 +17,8 @@ ch4f_C.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4f_C.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4g_BP.chem b/contrib/chem/examples/122/ch4g_BP.chem
index 2dc69ed97..6f3213236 100644
--- a/contrib/chem/examples/122/ch4g_BP.chem
+++ b/contrib/chem/examples/122/ch4g_BP.chem
@@ -17,8 +17,8 @@ ch4g_BP.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4g_BP.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4h_methacrylate.chem b/contrib/chem/examples/122/ch4h_methacrylate.chem
index ddf7f59fd..3032e64ef 100644
--- a/contrib/chem/examples/122/ch4h_methacrylate.chem
+++ b/contrib/chem/examples/122/ch4h_methacrylate.chem
@@ -17,8 +17,8 @@ ch4h_methacrylate.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4h_methacrylate.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4i_cyclo.chem b/contrib/chem/examples/122/ch4i_cyclo.chem
index 7d8ac92df..441e52ee7 100644
--- a/contrib/chem/examples/122/ch4i_cyclo.chem
+++ b/contrib/chem/examples/122/ch4i_cyclo.chem
@@ -17,8 +17,8 @@ ch4i_cyclo.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4i_cyclo.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4j_ring4.chem b/contrib/chem/examples/122/ch4j_ring4.chem
index d582e659f..0c15003e2 100644
--- a/contrib/chem/examples/122/ch4j_ring4.chem
+++ b/contrib/chem/examples/122/ch4j_ring4.chem
@@ -17,8 +17,8 @@ ch4j_ring4.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4j_ring4.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4k_ring3.chem b/contrib/chem/examples/122/ch4k_ring3.chem
index 52559eb4a..8f084aaeb 100644
--- a/contrib/chem/examples/122/ch4k_ring3.chem
+++ b/contrib/chem/examples/122/ch4k_ring3.chem
@@ -17,8 +17,8 @@ ch4k_ring3.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4k_ring3.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4l_vertex.chem b/contrib/chem/examples/122/ch4l_vertex.chem
index 1c58cdfca..c2678a70b 100644
--- a/contrib/chem/examples/122/ch4l_vertex.chem
+++ b/contrib/chem/examples/122/ch4l_vertex.chem
@@ -17,8 +17,8 @@ ch4l_vertex.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4l_vertex.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4m_double.chem b/contrib/chem/examples/122/ch4m_double.chem
index 82f57775e..ab8de659e 100644
--- a/contrib/chem/examples/122/ch4m_double.chem
+++ b/contrib/chem/examples/122/ch4m_double.chem
@@ -17,8 +17,8 @@ ch4m_double.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4m_double.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4n_triple.chem b/contrib/chem/examples/122/ch4n_triple.chem
index ba2fc390f..0b2c76c06 100644
--- a/contrib/chem/examples/122/ch4n_triple.chem
+++ b/contrib/chem/examples/122/ch4n_triple.chem
@@ -17,8 +17,8 @@ ch4n_triple.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4n_triple.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4o_aromatic.chem b/contrib/chem/examples/122/ch4o_aromatic.chem
index 1539c5527..b76c8f6b2 100644
--- a/contrib/chem/examples/122/ch4o_aromatic.chem
+++ b/contrib/chem/examples/122/ch4o_aromatic.chem
@@ -17,8 +17,8 @@ ch4o_aromatic.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4o_aromatic.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4p_cholestanol.chem b/contrib/chem/examples/122/ch4p_cholestanol.chem
index 692aaf25a..747445f52 100644
--- a/contrib/chem/examples/122/ch4p_cholestanol.chem
+++ b/contrib/chem/examples/122/ch4p_cholestanol.chem
@@ -17,8 +17,8 @@ ch4p_cholestanol.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4p_cholestanol.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4q_rings.chem b/contrib/chem/examples/122/ch4q_rings.chem
index ff5eaa1f1..9c8e358b9 100644
--- a/contrib/chem/examples/122/ch4q_rings.chem
+++ b/contrib/chem/examples/122/ch4q_rings.chem
@@ -17,8 +17,8 @@ ch4q_rings.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4q_rings.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4r_spiro.chem b/contrib/chem/examples/122/ch4r_spiro.chem
index f3f929cb2..be32fbf26 100644
--- a/contrib/chem/examples/122/ch4r_spiro.chem
+++ b/contrib/chem/examples/122/ch4r_spiro.chem
@@ -17,8 +17,8 @@ ch4r_spiro.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4r_spiro.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4s_heteroatoms.chem b/contrib/chem/examples/122/ch4s_heteroatoms.chem
index a6ffb0b0f..58c0ae806 100644
--- a/contrib/chem/examples/122/ch4s_heteroatoms.chem
+++ b/contrib/chem/examples/122/ch4s_heteroatoms.chem
@@ -17,8 +17,8 @@ ch4s_heteroatoms.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4s_heteroatoms.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4t_polycyclic.chem b/contrib/chem/examples/122/ch4t_polycyclic.chem
index 64e2860ec..9432595e0 100644
--- a/contrib/chem/examples/122/ch4t_polycyclic.chem
+++ b/contrib/chem/examples/122/ch4t_polycyclic.chem
@@ -17,8 +17,8 @@ ch4t_polycyclic.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4t_polycyclic.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4u_nicotine.chem b/contrib/chem/examples/122/ch4u_nicotine.chem
index a59dd56c2..67311cf1a 100644
--- a/contrib/chem/examples/122/ch4u_nicotine.chem
+++ b/contrib/chem/examples/122/ch4u_nicotine.chem
@@ -17,8 +17,8 @@ ch4u_nicotine.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4u_nicotine.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4v_histidine.chem b/contrib/chem/examples/122/ch4v_histidine.chem
index f4a37969d..7d3cac9f0 100644
--- a/contrib/chem/examples/122/ch4v_histidine.chem
+++ b/contrib/chem/examples/122/ch4v_histidine.chem
@@ -17,8 +17,8 @@ ch4v_histidine.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4v_histidine.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4w_lsd.chem b/contrib/chem/examples/122/ch4w_lsd.chem
index 1e83f59a3..390f2e5aa 100644
--- a/contrib/chem/examples/122/ch4w_lsd.chem
+++ b/contrib/chem/examples/122/ch4w_lsd.chem
@@ -17,8 +17,8 @@ ch4w_lsd.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4w_lsd.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4x_anisole.chem b/contrib/chem/examples/122/ch4x_anisole.chem
index ca613e111..61f382fbb 100644
--- a/contrib/chem/examples/122/ch4x_anisole.chem
+++ b/contrib/chem/examples/122/ch4x_anisole.chem
@@ -17,8 +17,8 @@ ch4x_anisole.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4x_anisole.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4y_reserpine.chem b/contrib/chem/examples/122/ch4y_reserpine.chem
index c2c34cd14..7105e0ff0 100644
--- a/contrib/chem/examples/122/ch4y_reserpine.chem
+++ b/contrib/chem/examples/122/ch4y_reserpine.chem
@@ -18,8 +18,8 @@ ch4y_reserpine.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -27,10 +27,7 @@ ch4y_reserpine.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem b/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
index bed5dc359..c0560daab 100644
--- a/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
+++ b/contrib/chem/examples/122/ch4z1_eqn_glutamic.chem
@@ -21,8 +21,8 @@ delim $$
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -30,10 +30,7 @@ delim $$
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch4z2_text.chem b/contrib/chem/examples/122/ch4z2_text.chem
index ad650701f..840440959 100644
--- a/contrib/chem/examples/122/ch4z2_text.chem
+++ b/contrib/chem/examples/122/ch4z2_text.chem
@@ -17,8 +17,8 @@ ch4z2_text.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch4z2_text.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch5a_size.chem b/contrib/chem/examples/122/ch5a_size.chem
index 8a3da6215..18b31284b 100644
--- a/contrib/chem/examples/122/ch5a_size.chem
+++ b/contrib/chem/examples/122/ch5a_size.chem
@@ -17,8 +17,8 @@ ch5a_size.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch5a_size.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch6a_pic.chem b/contrib/chem/examples/122/ch6a_pic.chem
index 556a5a602..c6478fe8e 100644
--- a/contrib/chem/examples/122/ch6a_pic.chem
+++ b/contrib/chem/examples/122/ch6a_pic.chem
@@ -17,8 +17,8 @@ ch6a_pic.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch6a_pic.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/ch6b_dna.chem b/contrib/chem/examples/122/ch6b_dna.chem
index afc9aad40..2ab61c973 100644
--- a/contrib/chem/examples/122/ch6b_dna.chem
+++ b/contrib/chem/examples/122/ch6b_dna.chem
@@ -17,8 +17,8 @@ ch6b_dna.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ch6b_dna.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAa_polymer.chem b/contrib/chem/examples/122/chAa_polymer.chem
index a3372e83e..64ef7eba3 100644
--- a/contrib/chem/examples/122/chAa_polymer.chem
+++ b/contrib/chem/examples/122/chAa_polymer.chem
@@ -17,8 +17,8 @@ chAa_polymer.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAa_polymer.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAb_vinyl_chloro.chem b/contrib/chem/examples/122/chAb_vinyl_chloro.chem
index 07a657b98..a8817fa99 100644
--- a/contrib/chem/examples/122/chAb_vinyl_chloro.chem
+++ b/contrib/chem/examples/122/chAb_vinyl_chloro.chem
@@ -17,8 +17,8 @@ chAb_vinyl_chloro.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAb_vinyl_chloro.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAc_morphine.chem b/contrib/chem/examples/122/chAc_morphine.chem
index 9d37ebb17..bd82f612f 100644
--- a/contrib/chem/examples/122/chAc_morphine.chem
+++ b/contrib/chem/examples/122/chAc_morphine.chem
@@ -17,8 +17,8 @@ chAc_morphine.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAc_morphine.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAd_chlorophyll.chem b/contrib/chem/examples/122/chAd_chlorophyll.chem
index 90b9ab691..b6b2254af 100644
--- a/contrib/chem/examples/122/chAd_chlorophyll.chem
+++ b/contrib/chem/examples/122/chAd_chlorophyll.chem
@@ -17,8 +17,8 @@ chAd_chlorophyll.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAd_chlorophyll.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAe_chair.chem b/contrib/chem/examples/122/chAe_chair.chem
index a5d57eea4..efecfebc9 100644
--- a/contrib/chem/examples/122/chAe_chair.chem
+++ b/contrib/chem/examples/122/chAe_chair.chem
@@ -17,8 +17,8 @@ chAe_chair.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAe_chair.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAf_arrow.chem b/contrib/chem/examples/122/chAf_arrow.chem
index 8aa28f4ca..c8acc6605 100644
--- a/contrib/chem/examples/122/chAf_arrow.chem
+++ b/contrib/chem/examples/122/chAf_arrow.chem
@@ -20,8 +20,8 @@ delim $$
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -29,10 +29,7 @@ delim $$
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAg_circle.chem b/contrib/chem/examples/122/chAg_circle.chem
index c8ad03112..f53c25168 100644
--- a/contrib/chem/examples/122/chAg_circle.chem
+++ b/contrib/chem/examples/122/chAg_circle.chem
@@ -17,8 +17,8 @@ chAg_circle.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chAg_circle.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAh_brackets.chem b/contrib/chem/examples/122/chAh_brackets.chem
index cc2ccbd20..a33e31d82 100644
--- a/contrib/chem/examples/122/chAh_brackets.chem
+++ b/contrib/chem/examples/122/chAh_brackets.chem
@@ -20,8 +20,8 @@ delim $$
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -29,10 +29,7 @@ delim $$
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem b/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
index 7b73a59c6..d463495da 100644
--- a/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
+++ b/contrib/chem/examples/122/chAi_poly_vinyl_chloride.chem
@@ -18,8 +18,8 @@ chAi_poly_vinyl_chloride.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -27,10 +27,7 @@ chAi_poly_vinyl_chloride.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chBa_jump.chem b/contrib/chem/examples/122/chBa_jump.chem
index 343c0590f..2adf75f81 100644
--- a/contrib/chem/examples/122/chBa_jump.chem
+++ b/contrib/chem/examples/122/chBa_jump.chem
@@ -17,8 +17,8 @@ chBa_jump.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chBa_jump.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chBb_bonds.chem b/contrib/chem/examples/122/chBb_bonds.chem
index a14743fd8..0cf7b92c5 100644
--- a/contrib/chem/examples/122/chBb_bonds.chem
+++ b/contrib/chem/examples/122/chBb_bonds.chem
@@ -17,8 +17,8 @@ chBb_bonds.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chBb_bonds.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/122/chBc_rings.chem b/contrib/chem/examples/122/chBc_rings.chem
index 01822937d..e6b2fbeb2 100644
--- a/contrib/chem/examples/122/chBc_rings.chem
+++ b/contrib/chem/examples/122/chBc_rings.chem
@@ -17,8 +17,8 @@ chBc_rings.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ chBc_rings.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 ########################################################################
 
diff --git a/contrib/chem/examples/README.txt b/contrib/chem/examples/README.txt
index 2e2da232d..09131fa4f 100644
--- a/contrib/chem/examples/README.txt
+++ b/contrib/chem/examples/README.txt
@@ -46,8 +46,8 @@ This file is part of `chem', which is part of `groff'.
 
 `groff' is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
 
 `groff' is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
@@ -55,9 +55,7 @@ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.
 
 You should have received a copy of the GNU General Public License
-along with `groff'; see the files COPYING and LICENSE in the top
-directory of the `groff' source.  If not, write to the Free Software
-Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
+along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 
 ####### Emacs settings
diff --git a/contrib/chem/examples/atp.chem b/contrib/chem/examples/atp.chem
index ee4c79456..6bb7d7fce 100644
--- a/contrib/chem/examples/atp.chem
+++ b/contrib/chem/examples/atp.chem
@@ -20,8 +20,8 @@ atp.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -29,10 +29,7 @@ atp.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R1:	ring5 pointing left double 1,2 3,4 put N at 2 put N at 5
 B:	benzene put N at 2 with .V6 at R1.V3 with .V5 at R1.V4
diff --git a/contrib/chem/examples/cholesterin.chem b/contrib/chem/examples/cholesterin.chem
index 0fea39191..ae55df2f8 100644
--- a/contrib/chem/examples/cholesterin.chem
+++ b/contrib/chem/examples/cholesterin.chem
@@ -18,8 +18,8 @@ cholesterin.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -27,10 +27,7 @@ cholesterin.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R1:	ring6
 	bond -120 ; HO
diff --git a/contrib/chem/examples/ethamivan.chem b/contrib/chem/examples/ethamivan.chem
index 4dc3afe02..859b5de60 100644
--- a/contrib/chem/examples/ethamivan.chem
+++ b/contrib/chem/examples/ethamivan.chem
@@ -17,8 +17,8 @@ ethamivan.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ ethamivan.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R:	ring pointing left double 2,3 4,5 6,1
 	bond left from R.V1 ; O
diff --git a/contrib/chem/examples/lsd.chem b/contrib/chem/examples/lsd.chem
index f5d87b643..338d5eef9 100644
--- a/contrib/chem/examples/lsd.chem
+++ b/contrib/chem/examples/lsd.chem
@@ -17,8 +17,8 @@ lsd.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ lsd.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 F:	flatring5 pointing left put N at 5 double 3,4
 	H below F.N
diff --git a/contrib/chem/examples/morphine.chem b/contrib/chem/examples/morphine.chem
index faa83628f..d8efa6e05 100644
--- a/contrib/chem/examples/morphine.chem
+++ b/contrib/chem/examples/morphine.chem
@@ -19,8 +19,8 @@ morphine.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -28,10 +28,7 @@ morphine.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R1:	benzene
 R2:	benzene with .V6 at R1.V2 with .V5 at R1.V3 put N at 4
diff --git a/contrib/chem/examples/penicillin.chem b/contrib/chem/examples/penicillin.chem
index 0e8ad2197..dd800bde6 100644
--- a/contrib/chem/examples/penicillin.chem
+++ b/contrib/chem/examples/penicillin.chem
@@ -20,8 +20,8 @@ penicillin.chem:
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -29,10 +29,7 @@ penicillin.chem:
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R1:	flatring5 pointing up put S at 1 put N at 4
 	bond 45 at R1.V2
diff --git a/contrib/chem/examples/reserpine.chem b/contrib/chem/examples/reserpine.chem
index f18357e49..09e2e27a4 100644
--- a/contrib/chem/examples/reserpine.chem
+++ b/contrib/chem/examples/reserpine.chem
@@ -17,8 +17,8 @@ begin chem
 
 # `groff' is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
 
 # `groff' is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -26,10 +26,7 @@ begin chem
 # General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with `groff'; see the files COPYING and LICENSE in the top
-# directory of the `groff' source.  If not, write to the Free Software
-# Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301,
-# USA.
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 R1:	benzene pointing up
 	bond -120 from R1.V5 ; O