FIELD: technology for protecting audio/video data during transmission.
SUBSTANCE: during distribution in encrypted form of data between distribution center and at least one user module, instead of transferring information necessary for decryption simultaneously with aforementioned data, this information is grouped into file of decryption data which contains also data, determining access conditions for aforementioned audio-video data. This file is stored independently of aforementioned data and can be utilized both in case of immediate and delayed utilization of data.
EFFECT: possible distribution of audio-video data to all possible intermediaries while providing control over number of uses of these data.
2 cl, 2 dwg
