Patent ID: 7720351

Claim:
A system for protecting commercials in a digitally distributed and recorded video that minimizes user's inconveniences caused by restrictions imposed on playback of the video, comprising: at the distributor side, a video server for encrypting video data of a video program and commercials included in the program in order to prevent playing the video data with a video player not provided with a proper encryption key; and at the user side, a video player provided with the proper encryption key for playing the encrypted video data, wherein user's control is limited in such a way that fast forward and reverse playing is not performed and skip forward and backward are restricted by imposing a lower limit on playing time of skipped video, said lower limit being greater than a time of typical commercial break so that a part of video whose playing time is greater than the time of typical commercial break can be skipped but a part of video whose playing time is lesser than or equal to the time of typical commercial break cannot be skipped; thereby preventing a user from selectively skipping commercials without missing pieces of program itself and thus discouraging skipping when the user wants to watch an entire program, but still enabling quick browsing before watching the entire program as well as moving fast to any part of the program for watching that part again.