The Study And Constructions On Anti-pirate Codes In Digital Products

Digital fingerprinting technology aimed at copyright protection of digital products. Digital fingerprint can identify the different copies of the original data and the owner can trace the user coining the pirate from the residual fingerprints of the pirate, which can achieve the purpose of protecting intellectual property rights. In the copyright protection of digital products, the digital fingerprint should be encode and embedded into the digital products. The digital fingerprint can have more trace ability and more embedding quantity only when the encoding rules , the embedding and tracing algorithms is appropriate to the digital products it embedded.The key point is to prevent collusion attacks by pirates in the digital fingerprint theory, and the main solution is the using of traceability codes. This work is based on the core issue of digital fingerprint code and we study the constructions of the traceability codes , identifiable parents property codes, anti-collusion codes , frameproof codes and partial traceability codes, repectively.First, this thesis gives a new anti-collusion code construction method, which uses the strong part of balanced block design based on the rational normal curve on some subfield.By comparing to some known codes, we found the rate of code is significantly higher than them. Secondly, we also give three new methods on the constructions of frameproof codes: one is based on the packing design and the balanced incomplete block design(BIBD) ,and we get the frameproof codes having the code length , and ; the second is based on the resolvable balanced incomplete block design (RBIBD) ,and we also get a kind of frameproof code; at last, we construct the frameproof code from the strong part of balanced block design based on the rational normal curve on some subfield.Finally, The definition of partial traceability code is given. Similar to the traceability code, the partial traceability code also has the traceability while it may trace the work group or the company of the traitor. The partial traceability codes based on the traceability code, the concatenated method and the linear unequality error-correcting code are given ,respectively. The partial traceability code can be constructed on the {0,1} while the traceability code can only be constructed on the alphabet having more than three elements, so it is more fit for the protecting of digital product than ever used.