VERFAHREN UND VORRICHTUNG ZUM ERZEUGEN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS UND VERFAHREN UND VORRICHTUNG ZUM ABSPIELEN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS

摘要

The invention relates to a method for generating an encoded multimedia data stream, according to which first a start block (12) and then a user data block (14) are generated. The initial segment (20) of the user data block (20) contains unencoded user data which are followed by encoded user data (16). In this way a preview or prelist function can be implemented in a simple manner. In addition, a playback device can already play back the unencoded initial section (20) while the complete start block is being processed so as to obtain a multimedia data key for generating hash totals, etc. The above parallel processing makes it possible to use playback devices with limited storage and processing resources without having to accept excessively long delays.