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Method and terminal for encrypting and decrypting forwarding prohibition and mixed transmission mode DRM files

A transmission method, encryption and decryption technology, applied in electrical components, digital transmission systems, data exchange networks, etc., can solve problems such as information security not being guaranteed, illegal users cracking, etc., to reduce management costs, ensure security, and improve The effect of efficiency

Inactive Publication Date: 2008-05-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, since the content objects of FL and CD are sent in plain text, they may be cracked by illegal users during the sending process, and information security cannot be guaranteed.

Method used

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  • Method and terminal for encrypting and decrypting forwarding prohibition and mixed transmission mode DRM files
  • Method and terminal for encrypting and decrypting forwarding prohibition and mixed transmission mode DRM files

Examples

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Comparison scheme
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Embodiment Construction

[0038] When the present invention encrypts FL and CD type data into a DCF (encrypted data format of DRM) file, the content-name field of the DCF format is used to record the type information of FL and CD and a characteristic ID. When the DCF file is to be decrypted, the DCF file is quickly decrypted by obtaining the information in the content-name field.

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] content-name (content name) is a field defined in the DCF format, which represents a name of the corresponding DCF file. In the present invention, this field is set as a mandatory field. As shown in Table 1, this field includes three parts, wherein: the first part is type information, and in an embodiment, the "FLFile" character string can be used to represent the FL type. The "CDFile" character string indicates the type of CD; the second part is a delimiter, which is separa...

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Abstract

The invention discloses an encryption and decryption method of a forward limited and mixed transmission digital copyright management file, and the terminal for realizing the method. The encryption method comprises the following two situations: first, when the data type is forward limited (FL), obtain the key and the ID of the key from the key management, encrypt the data by utilizing the key, usethe ID of the key as the feature ID which is written-in the DCF file together with the type message; second, when the data type is mixed transmission, the CD pattern, register the analyzed copyright object to the copyright management, the copyright management asks the key and the ID of the key from the key management and encrypt the data by utilizing the key, and store the ID of the key in the copyright object. When the copyright object is registered successfully, take the copyright ID as the feature ID which is written-in the DCF file together with the type message. The invention has the advantages that the cipher text object sent by FL and CD can be encrypted and decrypted rapidly and efficiently.

Description

technical field [0001] The invention belongs to the field of mobile communication, in particular to the security protection of terminal digital copyright management system in the field of mobile communication. Background technique [0002] Digital Rights Management (DRM) technology aims to provide and use digital content in a manageable manner to ensure that intellectual property rights are always protected throughout the value chain. There are two types of entities in DRM: Content Objects and Rights Objects. There are three implementation methods: Forward Lock (FL for short), Combined Delivery (CD for short), and Separate Delivery (SD for short). The content objects of the first two methods are sent in clear text, the difference is that the copyright object of the CD method is sent together with the content object. In the third way, the SD way, the copyright object and the content object are sent separately, and the content object is sent in cipher text. In the prior art...

Claims

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Application Information

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IPC IPC(8): H04L9/18H04L12/56H04L29/06
Inventor 官军
Owner ZTE CORP
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