Relicensing versus license compatibility (FSF Blog)

The Free Software Foundation has publisheda short article on relicensing versus license compatibility.

The FSF's Licensing andCompliance Lab receives many questions and license violation reportsrelated to projects that had their license changed by a downstreamdistributor, or that are combined from two or more programs underdifferent licenses. We collaborated with Yoni Rabkin, an experiencedand long time FSF licensing volunteer, on an updated version of hisarticle to provide the free software community with a generalexplanation on how the GNU General Public License (GNUGPL) isintended to work in such situations.