The current Collective Bargaining Agreement (CBA) negotiated between the league’s owners and players was ratified August 4, 2011. This CBA is in force for 10 years through the end of the 2020 League Year, with a guarantee of a 2021 NFL Draft after the expiration of this agreement.
The signatures of NFL Commissioner Roger Goodell and NFLPA Executive Director DeMaurice Smith can be found on page 272 of the PDF document.
For comparison purposes, the previous CBA which ran from 2006-2012, the adjustments for the final capped season of 2010 under that agreement and the 2011 Transition Rules can be found below.
The previous Collective Barganing Agreement between the National Football League Management Council (owners) and the NFL Players Association was ratified March 8, 2006, and was to remain in effect through the 2012 NFL League Year. The NFLMC terminated the final two Capped Years (2010 & 2011), and by agreement, that action meant the CBA terminated at the end of the 2010 League Year in mid-March 2011.
The above documents are the CBA as ratified in 2006, the adjustments to the CBA for the 2010 League Year after the final two Capped Seasons (’10 and ’11) were terminated by the NFLMC and the transition rules that the NFL played under during the 2011 season.