update README to reflect gmplib licensing change

As of version 6.0.0, gmplib moved its licensing from LGPLv3+ to a
dual-license LGPLv3+/GPLv2+ license.

This licensing change affects the licenses under which versions of
GnuTLS can be redistributed.

Update the README to reflect this change.

diff --git a/README b/README
index be27c6868ee4baab5f061b998accd166782d8a4e..beff45eeb1aebd2ec0bd7d1d7652f15c85783f35 100644 (file)
--- a/README
+++ b/README
@@ -104,11 +104,13 @@ LICENSING
 Since GnuTLS version 3.1.10, the core library has been released under
 the GNU Lesser General Public License (LGPL) version 2.1 or later.
 
-Note, however, that new versions of the gmplib library used by GnuTLS
-are distributed under LGPLv3, and as such binaries of this library
-need to be distributed under LGPLv3. If this is undesirable older
-versions of the gmplib which are under LGPLv2.1 (e.g., version 4.2.1)
-may be used instead.
+Note, however, that version 6.0.0 and later of the gmplib library used
+by GnuTLS are distributed under a LGPLv3+ or GPLv2+ dual license, and
+as such binaries of this library need to be distributed under the same
+LGPLv3+ or GPLv2+ dual license. If this is undesirable older versions
+of the gmplib which are under LGPLv2.1 (e.g., version 4.2.1) may be
+used instead. (gmplib versions between 4.2.2 through 5.1.3 were
+licensed under LGPLv3+ only).
 
 The GNU LGPL applies to the main GnuTLS library, while the
 included applications as well as gnutls-openssl