all GPL-compatible Free Software licenses are now an option

CONTRIBUTING.md

@@ -7,6 +7,9 @@ However, when the project is more mature, we (Jon Sneyers and Pieter Wuille, the
 For this reason, we ask contributors (i.e. authors of a pull request) to agree to the Contributor License Agreement (CLA) you can
 find in the file FLIF-CLA.pdf in this repository. That allows us to relicense FLIF, including your contributions, under a more
 permissive license like for example the GNU LGPL or Apache 2.0 license.
+More precisely, the set of _potential_ outbound licenses that can be considered,
+are the GPL-Compatible Free Software Licenses as listed on this page:
+https://gnu.org/licenses/license-list.html#GPLCompatibleLicenses
 
 Please add your signed CLA to http://github.com/jonsneyers/FLIF-CLAs/
 (you can find a template in FLIF-CLA-template.txt)

FLIF-CLA-template.txt

@@ -78,9 +78,12 @@ claims; and provided that this license is conditioned upon compliance with Secti
 As a condition on the grant of rights in Sections 2.1 and 2.2, We agree to license
 the Contribution only under the terms of the license or licenses which
 We are using on the Submission Date for the Material or the following additional
-licenses: Apache License 2.0, GNU General Public License v3.0 only,
-GNU Library General Public License v2 only, GNU Lesser General Public License v2.1 only,
-GNU Lesser General Public License v3.0 only, or GNU Affero General Public License v3
+licenses: Apache License 2.0, GNU General Public License v3.0 or any later version,
+GNU Library General Public License v2, GNU Lesser General Public License v2.1,
+GNU Lesser General Public License v3.0 or any later version, the GNU Affero
+General Public License v3 or any later version, and all other GPL-Compatible
+Free Software Licenses approved by the Free Software Foundation and listed
+on this website: https://gnu.org/licenses/license-list.html#GPLCompatibleLicenses
 (including any right to adopt any future version of a license if permitted).