07720351 is referenced by 49 patents and cites 6 patents.

A system for protecting commercials included in a digitally distributed and recorded video that minimizes user's inconveniences resulting from restrictions imposed on playback of the video. The video is encrypted at the distributor side and playback of the encrypted video at the user side is limited in such a way that fast forward and reverse playing is not performed, and a lower limit is imposed on skip forward and backward so that only parts of video whose playing time is greater than the time of typical commercial break can be skipped. This arrangement prevents a user from selectively skipping commercials without missing pieces of program itself and thus discourages skipping when the user wants to watch an entire program, but still enables quick browsing before watching the entire program as well as moving fast to any part of the program for watching that part again.

Title
Preservation and improvement of television advertising in digital environment
Application Number
11/96423
Publication Number
7720351 (B2)
Application Date
April 4, 2005
Publication Date
May 18, 2010
Inventor
Gutman Levitan
Stamford, 06901
CT, US
Agent
Ilya Zborovsky
IPC
G06F 3/00
H04N 5/91
View Original Source