Hall of Fame patch?

The Broncos and Raiders appear to be wearing what looks like a Hall of Fame patch. Not sure of the significance:

http://www.gettyimages.com/detail/news-photo/joel-dreessen-and-peyton-manning-of-the-denver-broncos-news-photo/157830312

Answering my own question, it's to recognize the Hall's 50th anniversary:

http://www.profootballhof.com/history/2012/12/4/NFL-to-celebrate-Football-Hall-of-Fame-Anniversary/

There will be a league-wide participation over the next two weeks.

http://www.profootballhof.com/history/2012/12/4/NFL-to-celebrate-Football-Hall-of-Fame-Anniversary/

Several teams were forced to wear the patch on the right shoulder due to existing graphics (PITT, NYJ - team logos, KC - Lamar Hunt patch, HOU - 10th Anniversary patch) already residing on the left shoulder.

Captaincy patches played havoc for some players with the patch worn on the right side (as noted above) creating a patch-logjam.

New Orleans wore their HOF patches high on the shoulder almost up to their TV numbers instead of around the more common collarbone area.

Baltimore wore the HOF patch in Week 14 but was the only team to NOT sport the patch in Week 15.

Buffalo opted to wear ONLY the HOF patch in Week 15 for their annual game in Toronto instead of pairing it with the traditional "Toronto Series" patch.