This website is an archive. It was used for drafting and public consultation on GPLv3 and version 3 of other GNU licenses which were published in 2007. For up to date information, see https://www.gnu.org/licenses/licenses.html. For more information about this archive, see https://www.fsf.org/licensing/gplv3-archive

From GPLv3 Wiki

This is a free software license but it is incompatible with the GPL.

The Common Public License is incompatible with the GPL because it has various specific requirements that are not in the GPL.

For example, it requires certain patent licenses be given that the GPL does not require. (We don't think those patent license requirements are inherently a bad idea, but nonetheless they are incompatible with the GNU GPL.)