Method and device for protecting network digital multimedia copyright

Abstract

The embodiment of the invention provides a method and device for protecting network digital multimedia copyright. The method comprises the following steps: acquiring an LDM (Logical Data Model) of an authorization transfer message; carrying out signature verification on the LDM by using a public key of an issuer; after verifying the signature verification, decrypting the LDM by using a private key of playing equipment so as to extract content decryption keys from the LDM; and decrypting corresponding decrypted multimedia files by using the content decryption keys. The device comprises a message acquisition unit, a signature verification unit, a message extraction unit and a file decryption unit, wherein the message acquisition unit is used for acquiring the LDM of the authorization transfer message, the signature verification unit is used for carrying out signature verification on the LDM by using the public key of the issuer, the message extraction unit is used for decrypting the LDM by using the private key of the playing equipment so as to extract the content decryption keys from the LDM after verifying the signature verification, and the file decryption unit is used for decrypting the corresponding decrypted multimedia files by using the content decryption keys. The invention provides a secure and strict key transfer manner so as to guarantee that a security protection mechanism is fully realized.

Description

technical field [0001] The invention relates to the technical field of multimedia copyright protection, in particular to a network digital multimedia copyright protection method and device. Background technique [0002] DRM (Digital Rights Management, content digital copyright encryption protection technology) technology is currently the most used digital content protection technology, widely used in video and audio protection transmitted over the network. The working principle of DRM technology is to establish a digital program authorization center first. The encoded and compressed digital program content can be encrypted and protected (locked) with a key (Key), and the encrypted digital program header stores the KeyID and the URL of the program authorization center. When a user orders a program, according to the KeyID and URL information at the head of the program, the digital program authorization center can send the relevant key to decrypt (unlock) after the verificatio...

AI Technical Summary

Problems solved by technology

[0007] Current status of DRM: Since the DRM system only protects the source and transmission of the content, and does not include technologies such as piracy tracking, once the key is cracked by hackers, the entire system will be broken, and the content cannot be effectively protected

On February 6, 2007, Jobs issued an open letter to the outside world, stating that Apple has concluded that if it provides DRM protection to other companies, it still cannot guarantee that songs purchased from major record companies will not be pirated.

To the annoyance of consumers who pay to download music, music downloaded from the iPod music store iTunes is DRM-protected and cannot be played on players such as SanDisk, Creative or Microsoft's Zune

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