Multimedia contents are easy to copy and tamper with, so artists and providers are worried about theft of contents. This discourages secondary legal use and sending information from the provider, so there is an urgent need for copyright protection. There is a technique called "invisible digital watermarking" that can be applied for this purpose. This technique can deter from illegal use without to losing the advantages of digital information. In this paper, we explain a watermark technique for motion pictures, and introduce its application.
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