Multimedia copyright protection method for supporting preview and tracking unauthorized distribution

A copyright protection and multimedia technology, applied in the direction of program/content distribution protection, selective content distribution, instruments, etc., can solve the problems of loss of economic interests of copyright owners, inability to track over-distributed users, etc., to achieve protection of interests and high returns Effect

Active Publication Date: 2011-05-18
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In the existing visible and erasable watermarking methods, there is a potential problem: when the user uses the correct key to erase the visible watermark from the multimedia carrier, the user can erase the visible watermark Multimedia d

Method used

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  • Multimedia copyright protection method for supporting preview and tracking unauthorized distribution
  • Multimedia copyright protection method for supporting preview and tracking unauthorized distribution
  • Multimedia copyright protection method for supporting preview and tracking unauthorized distribution

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Embodiment Construction

[0022] The present invention supports the method for previewing and tracking the multimedia copyright protection of unauthorized distribution, which is completed respectively at the sending end (such as the server end, etc.) and the receiving end (such as the user end, etc.), such as figure 2 shown. In the description of the drawings, the symbol represents the operation of multiplication, represents the operation of subtraction, Indicates the addition operation.

[0023] combine Figure 4 , taking a video as an example, give a visual watermark to embed a method at the sending end, the specific steps are as follows:

[0024] (1) Each frame of the multimedia video data and the visible watermark image data are respectively made non-overlapping o×q (the value of o, q is determined according to the size of the original image and the watermark image, which can be the same or different. The following is 8× 8 as an example to illustrate) block. Then, after performing DCT tra...

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Abstract

The invention discloses a multimedia copyright protection method for supporting preview and tracking unauthorized distribution, which comprises the following steps of: embedding a visible watermark, changing each discrete cosine transform (DCT) coefficient of the visible watermark at a transmitting end, then adding the image of each changed DCT coefficient to the DCT coefficient of video data, and transmitting the video data containing the watermark to a receiving end through a broadcast network for preview of the receiving end; interacting the receiving end with the transmitting end; erasingthe visible watermark by using a received watermark key at the receiving end by a user to recover high-quality video data; and when the visible watermark is erased, embedding digital fingerprints of the user into the video data, the visible watermark of which is erased, by the user by using the received digital fingerprint key. The broadcast signal provider only needs to broadcast the signals of the same path to all users, and the users can determine whether to purchase the higher-quality signals in a preview mode.

Description

technical field [0001] The invention belongs to the technical field of multimedia content protection, in particular to a multimedia copyright protection method that supports preview and traces unauthorized distribution in a broadcast environment. Background technique [0002] Multimedia data broadcasting can broadcast multimedia data to multiple users at one time, that is, the sender only sends one data stream, and multiple users can receive this data stream. [0003] In multimedia copyright protection, digital watermark plays an important role. Digital watermarking can be divided into two types: visible watermarking and invisible watermarking. These two types of watermarking technologies play different roles in multimedia copyright protection. [0004] The visible watermarking technology protects the copyright of multimedia data by embedding a visible watermark (such as a logo) marked with copyright information in the multimedia data. Visible watermarks can be divided int...

Claims

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Application Information

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IPC IPC(8): H04N21/266H04N21/254H04N21/8358H04N7/30G06F21/00G06F21/10
Inventor 戴跃伟李宏圆刘光杰翟江涛
Owner NANJING UNIV OF SCI & TECH
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