Copy Detection Mechanisms for Digital Documents

In a digital library system, documents are available in digital form and therefore are more easily copied and their copyrights are more easily violated. This is a very serious problem, as it discourages owners of valuable informationfrom sharing it with authorized users. There are two main philosophies for addressing this problem: prevention and detection. The former actually makes unauthorized use of documents di cult or impossible while the latter makes it easier to discover such activity. In this paper we propose a system for registering documents and then detecting copies, either complete copies or partial copies. We describe algorithms for such detection, and metrics required for evaluating detection mechanisms covering accuracy, e ciency, and security. We also describe a working prototype, called COPS, describe implementation issues, and present experimental results that suggest the proper settings for copy detection parameters.

• Type: Conference
• Year: 1995
• Where: SIGMOD
• Authors: Sergey Brin, James Davis, Hector Garcia-Molina
• Keywords: Copy Detection Parameters, Database, Digital Library System, Documents Di Cult, SIGMOD 1995