Patent ID: 6735311
Filing Date: 2004-05-11
Classification: H04L,H04N

Abstract:
A method for ciphering multimedia data to obtain an ciphered multimedia file having a definition data block and a multimedia data block, comprising the following steps:entering a definition data ciphering index in the definition data block which points to a definition data ciphering algorithm to be used for ciphering a section of the definition data block; entering a multimedia data ciphering index in the definition data block which points to a multimedia data ciphering algorithm to be used for ciphering at least part of the multimedia data block; entering a free index in the definition data block, the free index identifying a particular deciphering device with which the ciphered multimedia data can be deciphered beyond a specified period of time; selecting the definition data ciphering algorithm from a plurality of ciphering algorithms on the basis of the definition data ciphering index; selecting the multimedia data ciphering algorithm from a plurality of ciphering algorithms on the basis of the multimedia data ciphering index; ciphering the section of the definition data block with the definition data ciphering algorithm, the section of the definition data block not including the definition data ciphering index; and at least partially ciphering the multimedia data block with the multimedia data ciphering algorithm.