Method and apparatus for ensuring the copy protection of digital data
First Claim
1. A method of ensuring data is copy protected, the method comprising:
- receiving input data at a processing station;
modifying a copy protection process to enable the removal of predetermined noise signals comprising erroneous signals added into the input data at pre-selected locations, upon detecting that the input data include the predetermined noise signals; and
applying the modified copy protection process to the input data thereby both removing the predetermined noise signals, upon detecting that the input data include the predetermined noise signals, and copy protecting the input data.
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0 Petitions
Accused Products
Abstract
When digital data is to be copy protected at a processing station, for example, prior to its encoding and recording onto an optical disc, it is necessary to control a compliant encoder to utilise copy protection files to perform the copy protection routine. To ensure that the digital data is reliably copy protected, predetermined noise signals are incorporated into the digital data and the processing steps which add the copy protection are additionally caused to remove the noise signals. By this means, if the digital data is not copy protected, the noise signals remain. This enables non-copy protected digital data to be readily identified and ensures that it is effectively unusable to a consumer.
21 Citations
29 Claims
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1. A method of ensuring data is copy protected, the method comprising:
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receiving input data at a processing station; modifying a copy protection process to enable the removal of predetermined noise signals comprising erroneous signals added into the input data at pre-selected locations, upon detecting that the input data include the predetermined noise signals; and applying the modified copy protection process to the input data thereby both removing the predetermined noise signals, upon detecting that the input data include the predetermined noise signals, and copy protecting the input data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. Apparatus for copy protecting input data comprising a processing station arranged to receive input data, the input data including predetermined noise signals comprising erroneous signals added into the input data at pre-selected locations, said processing station including a copy protection process, a preparatory circuit to modify the copy protection process to enable the removal of the predetermined noise signals, and an encoder circuit responsive to the preparatory circuit, wherein the encoder circuit encodes the input data to produce a processed digital data output which is copy protected, wherein the modified copy protection process causes the encoder circuit to remove the predetermined noise signals from the processed digital data output.
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27. Apparatus for copy protecting input data comprising a processing station arranged to receive input data and to output processed digital data, said processing station by including a noise generator which adds predetermined noise signals comprising erroneous signals added into the input data at pre-selected locations, a copy protection process, a preparatory circuit to modify the copy protection process to enable the removal of the predetermined noise signals, and an encoder circuit responsive to the preparatory circuit, wherein the encoder circuit encodes the input data to produce processed digital data which is copy protected, wherein the modified copy protection process causes the encoder circuit to remove the predetermined noise signals from the processed digital data output.
- 28. A data carrier carrying encoded digital data for recording on an optical master disc, the digital data having been processed from input data, the input data including predetermined noise signals comprising erroneous signals added into the input data at pre-selected locations, the digital data having been processed by modifying a copy protection process to enable the removal of the predetermined noise signals, and applying the modified copy protection process to the input data thereby both removing the predetermined noise signals and copy protecting the input data.
Specification