Patent ID: 6980650
Filing Date: 2005-12-27
Classification: H04H,H04N

Abstract:
1. A computer-implemented method for processing scrambled content, the scrambled content being divided into frames, the method comprising: identifying a plurality of frames to be descrambled; for each frame of the plurality of frames, identifying a key period associated with a key for descrambling the frame; and for at least one frame f of the plurality of frames: wherein the substituting comprises: determining a first number of key periods to be skipped for each key period to be descrambled, the first number being greater than or equal to 1; determining a plurality of groups of key periods, each group including one key period to be descrambled and the first number of key periods to be skipped; determining a second number of frames to be provided from each group of the plurality of groups of key periods; and for each one group of the plurality of groups of key periods, choosing the second number of frames to be provided from within the one key period to be descrambled, the one key period being comprised in the one group.