Watermark system
First Claim
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1. A method for examining an electronic representation of an item for a watermark, the method comprising:
- examining at least a first electronic representation of an item for a watermark in accordance with a first watermark definition;
when it is appropriate to use a new watermark definition receiving a new watermark definition signal indicating that a second watermark definition is to be used for examining electronic representations; and
in normal operation, performing the following in response to receiving the new watermark definition signal;
ceasing said examining at least a first electronic representation of an item for a watermark in accordance with a first watermark definition; and
examining at least a second electronic representation of an item for a watermark in accordance with the second watermark definition.
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Abstract
A method for examining an electronic representation of an item for a watermark, the method including examining at least a first electronic representation of an item for a watermark in accordance with a first watermark definition, receiving a signal indicating that a second watermark definition is to be used for examining electronic representations, and examining at least a second electronic representation of an item for a watermark in accordance with the second watermark definition.
Related apparatus and methods are also provided.
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Citations
30 Claims
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1. A method for examining an electronic representation of an item for a watermark, the method comprising:
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examining at least a first electronic representation of an item for a watermark in accordance with a first watermark definition; when it is appropriate to use a new watermark definition receiving a new watermark definition signal indicating that a second watermark definition is to be used for examining electronic representations; and in normal operation, performing the following in response to receiving the new watermark definition signal; ceasing said examining at least a first electronic representation of an item for a watermark in accordance with a first watermark definition; and examining at least a second electronic representation of an item for a watermark in accordance with the second watermark definition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 23, 24, 25, 26)
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10. A watermark examiner for examining an electronic representation of an item for a watermark, the examiner comprising:
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a watermark definition store operative to store a first watermark definition; watermark examination apparatus operatively associated with the watermark definition store and operative to examine an electronic representation of an item for a watermark in accordance with the first watermark definition stored in the watermark definition store; and a watermark definition signal receiver operative, when it is appropriate to use a new watermark definition, to receive a new watermark definition signal indicating that a new watermark definition is to be used for examining electronic representations and to store the new watermark definition in the watermark definition store, wherein the watermark examination apparatus is operative, in normal operation, to examine the electronic representation of an item for a watermark in accordance with the new watermark definition and to cease to examine the electronic representation of an item for a watermark in accordance with the first watermark definition in response to receipt of the new watermark definition signal by the watermark definition signal receiver. - View Dependent Claims (11, 12, 13, 14, 15, 16, 27, 28, 29, 30)
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17. A method for altering an electronic representation of an item having a watermark, the method comprising:
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providing a first electronic representation of an item, the first electronic representation comprising a first watermark, the first watermark corresponding to a first watermark definition; receiving a signal indicating that a second watermark definition is to be used; and in normal operation performing the following in response to receiving the signal; altering the first electronic representation to no longer comprise the first watermark and to comprise a second watermark corresponding to the second watermark definition; and
thereafterexamining at least a second electronic representation for the second watermark. - View Dependent Claims (18, 19)
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20. A watermark alteration system for altering an electronic representation of an item having a watermark, the system comprising:
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a watermark definition signal receiver for receiving a signal indicating that a second watermark definition is to be used; watermark alteration apparatus for altering a first electronic representation, the first electronic representation comprising a first watermark corresponding to a first watermark definition, to comprise a second watermark corresponding to the second watermark definition, wherein the watermark alteration apparatus is operative, in normal operation, to alter the first electronic representation to no longer comprise the first watermark and to comprise a second watermark corresponding to the second watermark definition in response to receipt of the signal by the watermark definition signal receiver; and watermark examining apparatus operative, in normal operation following receipt of the signal by the watermark definition signal receiver, to examine at least a second electronic representation for the second watermark. - View Dependent Claims (21, 22)
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Specification