Patent ID: 9641322
Date: 2017-05-02
CPC Classifications: H04L,H04N

Claim:
1. A video processing device for decrypting a compressed video signal from at least one partially encrypted elementary bit stream, the video processing device comprising: a machine that includes: a key storage device for storing at least one decryption key; and a decryption processing device, coupled to the key storage device, that retrieves the at least one decryption key from the key storage device, that segments the at least one partially encrypted elementary bit stream into a plurality of blocks, wherein segmenting the plurality of blocks includes separating the plurality of blocks into a first subset of blocks of standard length and a second subset of blocks of non-standard length, and that decrypts at least one partially encrypted elementary bit stream into a decrypted elementary bit stream, by applying a first of a plurality of decryption methods for decrypting each of the first subset of blocks of standard length and applying a second of the plurality of decryption methods for decrypting each of the second subset of blocks of non-standard length separately from the first subset of blocks of standard length; wherein first portions of the at least one partially encrypted elementary bit stream are encrypted and second portions of the at least one partially encrypted elementary bit stream are unencrypted.