From Fedora Project Wiki

MPEG-1 patent status not more complicated than FAQ implies

Josh, you really need to stop pushing this one. You're starting to cross the line between information and trolling. Fedora Legal feels that there is still a high probability of patent risk in all MPEG technologies, including MPEG-1 and MPEG-2. This is a widely accepted fact in the IP field, the space is so heavily patented that only the passage of time will render MPEG safe. Tom Callaway, Fedora Legal

Thank you for your reply. I apologize for crossing the line to trolling. This is the first time that I have seen a public comment that implies that there are lawyers who believe there is still patent risk in MPEG-1. I guess we may have to wait until December 2012 for the patent air to start clearing. Josh Cogliati