| 摘要 |
The present invention relates to a method, for watermarking a processing module ( 105 ), said processing module ( 105 ) being configured to process an electronic signal thereby forming a processed signal, comprising the steps of applying a first functional operator ( 104 ) arranged to cause a significant alternation to said processed signal, said first operator ( 104 ) being embedded in said processing module ( 105 ), and arranging a second functional operator ( 109 ) configured to co-operate with said first operator ( 104 ) such that said alternation is essentially cancelled. The second operator ( 109 ) is adapted to act as an extractable identifier serving as a watermark for said processing module ( 105 ). An advantage with the method is the fact that since the first and the second operators are implemented as functional processing blocks, conventional debugging tools can not be used to attack the processing module.
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