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Abstract-Multiparty multilevel digital rights management (DRM) architecture involving several levels of distributors in between an owner and a consumer has been suggested as an alternative business model to the traditional two-party (buyer-seller) DRM architecture for digital content delivery. In the two-party DRM architecture, cryptographic techniques are used for secure delivery of the content and watermarking techniques are used for protecting the rights of the seller and the buyer. The cryptographic protocols used in two-party case for secure content delivery can be directly applied to the multiparty multilevel case. However, the watermarking protocols used in two-party case may not directly carry over to the multiparty multilevel case as it need to address the simultaneous security concerns of multiple parties such as owner, multiple levels of distributors and consumers. Towards this, in this paper we propose a joint digital watermarking scheme using Chinese remainder theorem for the multiparty multilevel DRM architecture. In the proposed scheme, a watermark information is jointly created by all the parties involved and then a watermark signal is generated out of it and embedded into the content. This scheme takes care of the security concerns of all the parties involved. Further, in the event of finding an illegal copy of the content, the traitors can be traced back.

Digital asset management systems (DAMS) generally handle media data in a compressed and encrypted form. It is sometimes necessary to watermark these compressed encrypted media items in the compressed-encrypted domain itself for tamper detection or ownership declaration or copyright management purposes. It is a challenge to watermark these compressed encrypted streams as the compression process would have packed the information of raw media into a low number of bits and encryption would have randomized the compressed bit stream. Attempting to watermark such a randomized bit stream can cause a dramatic degradation of the media quality. Thus it is necessary to choose an encryption scheme that is both secure and will allow watermarking in a predictable manner in the compressed encrypted domain. In this paper, we propose a robust watermarking algorithm to watermark JPEG2000 compressed and encrypted images. The encryption algorithm we propose to use is a stream cipher. While the proposed technique embeds watermark in the compressed-encrypted domain, the extraction of watermark can be done in the decrypted domain. We investigate in detail the embedding capacity, robustness, perceptual quality and security of the proposed algorithm, using these watermarking schemes: Spread Spectrum (SS), Scalar Costa Scheme Quantization Index Modulation (SCS-QIM), and Rational Dither Modulation (RDM).Index Terms-Compressed and encrypted domain watermarking, JPEG2000.