Method for watermarking a content

A non-transitory program storage device, readable by a computer, tangibly embodying a program of instructions executable by the computer to perform a method, wherein a content is available in different versions on a server for at least a client and wherein said different versions of the content are subdivided into temporally aligned chunks, the method comprising:

• obtaining for each version of the content candidate locations for watermarking;
• determining a watermark payload bit insertion rate according to a minimum path, wherein said minimum path comprises, for all sets of temporally aligned chunks, the chunks with the smallest number of candidate locations;
• and
• generating, for each version of the content, metadata for watermark embedding such that said watermark payload bit insertion rate is the same.

A device for preparing a content for watermarking, wherein said content is available in different versions and wherein said different versions of the content are subdivided into temporally aligned chunks, the device comprising:

• A profiler configured to obtain, for each version of the content, candidate locations for watermarking;
• A pre-formatter configured to determine a watermark payload bit insertion rate according to a minimum path, wherein said minimum path comprises, for all sets of temporally aligned chunks, the chunks with the smallest number of candidate locations;
• A formatter configured to generate, for each version of the content, metadata for watermark embedding such that said watermark payload bit insertion rate is the same;
• An inserter configured to insert watermark embedding metadata in each version of the content.

A device for watermarking a content, wherein said content is available in different versions and wherein said different versions of the content are subdivided into temporally aligned chunks, the device comprising:

• A profiler configured to obtain, for each version of the content, candidate locations for watermarking;
• A pre-formatter configured to determine a watermark payload bit insertion rate according to a minimum path, wherein said minimum path comprises, for all sets of temporally aligned chunks, the chunks with the smallest number of candidate locations;
• A formatter configured to generate, for each version of the content, metadata for watermark embedding such that said watermarking payload bit insertion rate is the same;
• An inserter configured to embed the payload by applying watermark embedding metadata to the content.