BUYER SELLER WATERMARKING PROTOCOL IN DIGITAL CINEMA free thesis
Digital Rights Management (DRM) has been hailed as the solution to illegal copying and distribution of digital movies. It employs many different kinds of mechanisms, such as encryption, watermarking, and digital fingerprinting, to provide a protection system to these high-valued digital assets. Not only to managing content’s access control and its usage rights, a DRM system also provides a forensics tracking device called digital fingerprint. However, digital fingerprinting always assumes the trustworthiness of content provider, and thus may cause customers to be subjects of framing and false implication. Complete control over the generation, insertion, and detection process enables the content provider to easily reproduce the content copy sent to a user, which can be then used to accuse a user of an unlawful act he did not do.
This customer’s right problem was successfully tackled by the concept of Buyer-Seller Watermarking Protocol, which accommodates the rights of both seller and buyer. Besides the normal digital fingerprint, another special mark, which is hidden from both involved parties, is inserted into the content, so that seller is unable to reproduce a buyer’s copy and, at the same time, buyer does not have the capability to remove the special mark.
Unfortunately, every existing buyer-seller watermarking protocol either fails or relies on the trustworthiness of Watermark Certification Authority (WCA) to solve the customer’s right problem. The involvement of WCA is required to generate and ensure the validity of watermark used in every transaction. As these protocols were, in the first place, assembled to eliminate the assumption on seller’s honesty, a requirement of a new trusted third party is undesirable.
Click here for free
download this paper