Patent ID: 7391866
Filing Date: 2008-06-24
Classification: H04H,H04N

Abstract:
1. A reception apparatus which receives scrambled content, and reproduces the scrambled content in a normal reproduction mode and in a particular reproduction mode, comprising: reception means for receiving the scrambled content and storage information, wherein (a) the scrambled content is a content which has been scrambled in units of frames so that the frames can be descrambled using descrambling keys that respectively correspond to each of the frames, and (b) the storage information includes a list of the descrambling keys which includes all of the descrambling keys; storage means for storing the received scrambled content and the storage information; list extraction means for extracting the list of descrambling keys from the stored storage information; descramble processing means for descrambling the scrambled content; and reproduction means for reproducing the descrambled content, wherein the normal reproduction mode is a mode which includes a play mode and in which all of the frames are descrambled and reproduced sequentially, the particular reproduction mode is a mode which includes a fast-play mode and in which only predetermined frames selectively extracted from less than all of the frames are descrambled and reproduced, and (a) in the normal reproduction mode, said list extraction means extracts all descrambling keys from the list of descrambling keys, said descramble processing means descrambles each frame of all of the frames using each of the extracted descrambling keys, and said reproduction means reproduces all of the frames descrambled by said descrambling means, and (b) in the particular reproduction mode, said list extraction means selectively extracts descrambling keys corresponding to the predetermined frames from the list of descrambling keys, said descramble processing means descrambles each of the predetermined frames using the extracted descrambling keys, and said reproduction means reproduces only the predetermined frames descrambled by said descrambling means so that the content is reproduced in a different speed than a speed of reproduction of the normal reproduction mode.