FIELD: data transmission.
SUBSTANCE: in accordance to the invention, data of content of input digital data is encrypted on basis of data of first key, which is then encrypted on basis of function, generated on basis of a random number, and data of second key, generated with usage of data of specific key of device and common key data. During decoding, encoded data is received, consisting of encrypted content data, encrypted first key data, random number and common key data, second key data is generated on basis of specific device key data and common key data, encrypted first key data is decoded on basis of generated second key data and function, generated on basis of random number, encrypted content data is decoded on basis of decoded data of first key.
EFFECT: unauthorized data copying is prevented.
2 cl, 13 dwg
