Fedora Core is one of the most popular free distributions of Linux and is the community version of Redhat Enterprise Linux.
With the pending release of Fedora Core 7, the Fedora project is attempting to merge the two primary repositories; Fedora Core and Fedora Extras. With the merging of these two repositories, the Fedora project is also considering requiring all packages in the repository to be "Free Software". (re: link.)
This change would benefit everybody involved with the Fedora Project. Users of Fedora would know that license restrictions were similar throughout the software available and developers would have an easier time integrating existing software with other packages provided.
Fedora has had a lot of negativity lately around packages not working well together and updates breaking fully functional systems. This change for Fedora Core 7 might improve much of the mess that has been made.