Amend licence to relax its conditions for chains of binary distributions.

git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@835 6239d852-aaf2-0410-a92c-79f79f948069

1 files changed, 16 insertions, 5 deletions

diff --git a/LICENCE b/LICENCE
index 402fe24..2b34d3f 100644
--- a/LICENCE
+++ b/LICENCE
@@ -5,9 +5,10 @@ PCRE2 is a library of functions to support regular expressions whose syntax
 and semantics are as close as possible to those of the Perl 5 language.
 
 Release 10 of PCRE2 is distributed under the terms of the "BSD" licence, as
-specified below. The documentation for PCRE2, supplied in the "doc"
-directory, is distributed under the same terms as the software itself. The data
-in the testdata directory is not copyrighted and is in the public domain.
+specified below, with one exemption for certain binary redistributions. The
+documentation for PCRE2, supplied in the "doc" directory, is distributed under
+the same terms as the software itself. The data in the testdata directory is
+not copyrighted and is in the public domain.
 
 The basic library functions are written in C and are freestanding. Also
 included in the distribution is a just-in-time compiler that can be used to
@@ -57,11 +58,11 @@ THE "BSD" LICENCE
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
-    * Redistributions of source code must retain the above copyright notice,
+    * Redistributions of source code must retain the above copyright notices,
       this list of conditions and the following disclaimer.
 
     * Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in the
+      notices, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
 
     * Neither the name of the University of Cambridge nor the names of any
@@ -80,4 +81,14 @@ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
 
+
+EXEMPTION FOR BINARY LIBRARY-LIKE PACKAGES
+------------------------------------------
+
+The second condition in the BSD licence (covering binary redistributions) does
+not apply all the way down a chain of software. If binary package A includes
+PCRE2, it must respect the condition, but if package B is software that
+includes package A, the condition is not imposed on package B unless it uses
+PCRE2 independently.
+
 End