Title:
光ディスクのコピープロテクト方法及びコピープロテクトされた光ディスク
Document Type and Number:
Japanese Patent JP4964429
Kind Code:
B2
Abstract:
Subversive DSV (SDSV) sequences of data symbols having a large absolute value of DSV are extremely valuable in the copy protection of optical discs as they can induce uncorrectable read errors. However, very few SDSV sequences of data symbols can be found in multimodal codes such as Eight-to-Sixteen Modulation (ESM) utilised in DVDs. It is required to select data symbols, for encoding using a multimodal code, which are capable of forcing an encoder to produce at least one subversive sequence of code words. A possible code word for a data symbol is selected if the code word has a large absolute value of DSV and there are no alternative code words, or all alternative code words are equivalent, or all alternatives except one are ruled out by RLL rules.
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Inventors:
Carmen Laura Basile
Application Number:
JP2005146089A
Publication Date:
June 27, 2012
Filing Date:
May 18, 2005
Export Citation:
Assignee:
Rovi Europe Limited
International Classes:
G11B20/10; G11B20/00; G11B20/14; H03M5/14
Domestic Patent References:
| JP200462969A | ||||
| JP2002279732A | ||||
| JP2002216435A | ||||
| JP200368024A | ||||
| JP2003123401A | ||||
| JP2003303468A | ||||
| JP8129828A | ||||
| JP200423607A | ||||
| JP2003243993A | ||||
| JP2002230783A | ||||
| JP2001351319A |
Foreign References:
| WO2003088239A1 | ||||
| WO1998001852A1 |
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito