Apparatus and method for authentication/copy protection of optical storage medium and the optical storage medium
AssigneeLG Electronics Inc.
InventorsJae-Sun Lee, Woon-Sung Yeo, Yong-Hoo Sheen
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Abstract
The method of recording data in a copy protected manner on an optical disk modifies at least a first signal in a data such that the modified first signal is reproduced as one of a plurality of target signals prior to error correction decoding. The method also includes error correction encoding the data prior to the modifying such that the reproduced target signals remain unchanged after error correction decoding. And, the modified encoded data is written on an optical storage medium.
Claims27
A method of recording data in a copy protected manner on an optical disk, comprising:
- modifying at least a first signal in data such that said modified first signal is reproduced as one of a plurality of target signals prior to error correction decoding;
- error correcting encoding said data prior to said modifying such that such reproduced target signals remain unchanged after error correction decoding;
- and
- writing said modified encoded data on an optical storage medium.
A method of recording data in a copy protected manner on an optical disk, comprising:
- choosing at least one pair of standard symbols from a list containing a plurality of pairs of standard symbols, each pair of standard symbols in said list including a first symbol and a second symbol differing by a number of zeros between consecutive ones;
- first generating first and second codes, said first code including at least one of said first symbol in said chosen pair of standard symbols and said second code including at least one of said second symbol in said chosen pair of standard symbols;
- second generating first and second parity symbols for said first and second codes, respectively;
- first modifying said first parity symbols;
- second modifying said first symbols in said first code;
- and
- writing said modified first code on an optical disk.
A copy protected recording medium having a data structure stored thereon, comprising:
- a test area storing test data, said test data including at least one modified first signal, said modified first signal having been modified such that when said modified first signal is reproduced, said modified first signal is reproduced as one of at least two target signals.
An apparatus for recording data in a copy protected manner on an optical disk, comprising:
- a shifter modifying at least a first signal in data such that said modified first signal is reproduced as one of a plurality of target signals prior to error correction decoding;
- an encoder error correcting encoding said data prior to said modifying such that said reproduced target signals remain unchanged after error correction decoding;
- and
- a mastering apparatus writing said modified encoded data on an optical storage medium.
An apparatus for recording data in a copy protected manner on an optical disk, comprising:
- an encoder generating first and second parity symbols for first and second codes, respectively, said first code including at least one of a first symbol and said second code including at least one of a second symbol, said first symbol and said second symbol differing by a number of zeros between consecutive ones, said encoder modifying said first parity symbols;
- a shifter modifying said first symbols in said first code;
- and
- a mastering apparatus writing said modified first code on an optical disk.
Dependencies are inferred from the claim text.