Invention Grant
US08260115B2 Method and product for copy protection of optical discs using unbalanced DC content
有权
使用不平衡直流含量的光盘复制保护的方法和产品
- Patent Title: Method and product for copy protection of optical discs using unbalanced DC content
- Patent Title (中): 使用不平衡直流含量的光盘复制保护的方法和产品
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Application No.: US12392970Application Date: 2009-02-25
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Publication No.: US08260115B2Publication Date: 2012-09-04
- Inventor: Philippe Marcel Henri Selve , Victor Kovner , Richard A. A. Heylen
- Applicant: Philippe Marcel Henri Selve , Victor Kovner , Richard A. A. Heylen
- Applicant Address: US CA Santa Clara
- Assignee: Rovi Europe Limited
- Current Assignee: Rovi Europe Limited
- Current Assignee Address: US CA Santa Clara
- Agency: Morrison & Foerster LLP
- Priority: GBGB2004/000241 20040123
- Main IPC: H04N9/80
- IPC: H04N9/80 ; H04N9/79
Abstract:
The present invention relates to a method of copy protecting optical discs, such as CDs or DVDs. Instead of encoding data onto the CD-ROMs in a conventional manner which ensures balanced dc content, for copy protection the digital data is encoded and recorded onto the optical disc such that it is arranged to give some of the recorded digital data highly unbalanced dc content. Thus, for example, the DSV (digital sum value) value of the encoded data is recorded so that the DSV value changes continuously once 50 frames of data or more.
Public/Granted literature
- US20090201781A1 METHOD AND PRODUCT FOR COPY PROTECTION OF OPTICAL DISCS USING UNBALANCED DC CONTENT Public/Granted day:2009-08-13
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