METHOD OF PROTECTING MULTIMEDIA CONTENT AND SERVICE Russian patent published in 2015 - IPC G06F21/10 H04L9/08 H04L9/12 

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to multimedia content protection. A method of protecting content (6) scrambled using a content key CW transmitted encrypted by a content access key K, characterised by that said content is transmitted by a transmission system to at least one receiving terminal (4) using a service, provided locally in said receiving terminal using a set of properties P_i, i ranges from 1 to n, known for the transmission system, where each of said properties P_i is represented by a data element x_i recorded in said data transmission system, and using a local data element y_i with local access, intended only for reading in said terminal, and during transmission, said method comprises a step of super-encrypting said content key CW using at least one invertible super-encryption function f_i(x_i), which depends on at least one of the properties P_i, i ranges from 1 to n, and upon reception, the value of said super-encrypted content key CW is disclosed by applying to said super-encrypted content key CW an inverse super-encryption function $$f_i^{-1}\left(y_i\right)$$ corresponding to the property P_i.

EFFECT: efficient protection of multimedia content from illegal redistribution.

9 cl, 3 dwg