Zhongyan Hu

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As a tool for interests in both storing and managing data, relational database is widely used in many information systems. In this paper, a novel method of watermarking is presented to protect relational databases copyright. We propose a novel multiple watermarking scheme, which embeds two image watermarks into relational database. The watermark embedding(More)
As a tool for interests in both storing and managing data, relational database is widely used in many information systems. This paper studies an improved algorithm to watermark numeric attributes in relational databases for copyright protection. We propose a novel watermarking method, which embeds an image watermark into relational results verify the(More)
The distributed product data management (DPDM) is the key effectively of the remote collaborative designing and manufacturing for complex product. A study project on DPDM and consistency control techniques based on collaborative service platform (CSP) in aero subcontract production (aero-SP) is put forwarded. First, in order to settle the problem of data(More)
Database Watermarking methods are used for copyright protection of relational database. Many techniques have been developed for watermarking multimedia digital assets like audio, video, text, images etc. But these methods are usually not applicable with numerical database, because to insert a watermark into a data, small error is created in data, called(More)
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