| 摘要 |
The present invention relates to a method for watermarking a processing module. The processing module is designed to process an electronic signal and form a processed signal involving steps of applying a first functional operator to cause a significant alteration to the processed signal. The first operator is embedded in the processing module. Additionally, a second functional operator is provided to co-operate with the first operator-so the alteration is essentially cancelled. The second operator-is adapted to act as an extractable identifier serving as a watermark for the processing module. 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 cannot be used to attack the processing module.
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