A method and apparatus for inserting a low frequency watermark into a compressed data stream carrying compressed content is disclosed. A portion of the compressed data stream is decoded to generate decoded content. The decoded content is analyzed to generate watermark insertion information. The compressed content is embedded with a low frequency watermark using the watermark insertion information.

 
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< Method and apparatus for encrypting media programs for later purchase and viewing

> Digital electronic component which is protected against electrical-type analyses

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