Abstract: Embodiments of the invention provide a method and a system for fingerprinting a data object at a server system and a method and a system for extracting the fingerprint from the data object at a client system. Sections of a data object are watermarked with known watermark data to create a first and a second variant of the data object, whereby the section boundaries are optionally saved as metadata. Using the metadata, the first and second variant are combined by taking sections from the variants to create a fingerprinted data object. From the fingerprinted data object, the watermark data can be extracted again.

Abstract: A method is described for distributing content using a P2P distribution system. The distribution system comprises a P2P network connected to a server system, wherein the server system is configured to divide the content in pieces and to provide the P2P network with piece variants of one or more pieces. The method comprises the steps of: providing a communication session between a client and the server system; the client sending a content request to the server system; the client receiving in response to the content request one more piece variant identifiers and distribution information comprising integrity information of all piece variants provided by the server system.

Abstract: Embodiments of the invention provide a method and a system for fingerprinting a data object at a server system and a method and a system for extracting the fingerprint from the data object at a client system. Sections of a data object are watermarked with known watermark data to create a first and a second variant of the data object, whereby the section boundaries are optionally saved as metadata. Using the metadata, the first and second variant are combined by taking sections from the variants to create a fingerprinted data object. From the fingerprinted data object, the watermark data can be extracted again.