METHOD TO PROTECT RECORDED MULTIMEDIA CONTENT Russian patent published in 2015 - IPC H04N21/433

Abstract RU 2547228 C1

FIELD: information technologies.

SUBSTANCE: in the method with the help of a network head device they perform, on a channel, broadcast (162) of scrambled multimedia content and ECM messages (entitlement control messages), which contain cryptograms CW^Ka of control words CW, providing for unscrambling of the appropriate cryptoperiod of scrambled multimedia content, the specified scrambled multimedia content and ECM messages are received with the help of one of recording devices, and the cryptogram CW^Ka is decoded (184) that is contained in the ECM message received with a subscription key K_a, the scrambled multimedia content is protected against reading, using the key KH_e, by means of coding (186) of decoded control words by means of the key KH_e for generation of cryptograms CW^KHe.

EFFECT: increased extent of protection of recorded multimedia content.

16 cl, 3 dwg

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RU 2 547 228 C1

Authors

Buaven Mat'E

Djubrejk Zhil'

Dates

2015-04-10—Published

2012-04-12—Filed