Synchronized interleaved watermarking

A server comprising:

• one or more processors;
• a non-transitory memory;
• and
• one or more programs stored in the non-transitory memory, which, when executed by the one or more processors, cause the server to:
• provision multiple control words used in a watermark cryptoperiod, including specifying to multiple entitlement control message generators (ECMGs) watermark cryptoperiod information of the watermark cryptoperiod, and causing the multiple ECMGs to notify a watermark inserter the watermark cryptoperiod information, wherein a cryptoperiod for encrypting a video stream is different from the watermark cryptoperiod for watermark embedding in multiple auxiliary streams associated with the video stream;
• assign, by the watermark inserter, a watermark identifier symbol index to the watermark cryptoperiod in response to receiving the notification of the watermark cryptoperiod information and signal the watermark identifier symbol index to the ECMGs;
• generate, by the multiple ECMGs, multiple entitlement control messages for producing the multiple control words, including associating each of the multiple entitlement control messages with the watermark identifier symbol index;
• move, by the watermark inserter, one or more portions from the video stream to the multiple auxiliary streams and generate, by the watermark inserter, multiple versions of the one or more portions to embed watermark symbols within the watermark cryptoperiod, wherein each of the multiple versions is associated with a respective one of the watermark symbols;
• and
• encrypt, upon receiving signaling of start of the watermark cryptoperiod according to the watermark cryptoperiod information, the multiple versions using the multiple control words at the start of the watermark cryptoperiod.