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A Practical Method for Watermarking Java Programs : Abstract

Java programs distributed through Internet are now suffering from program theft. It is because Java programs can be easily decomposed into reusable class files and even decompiled into source code by program users. In this paper we propose a practical method that discourages program theft by embedding Java programs with a digital watermark. Embedding a program developer’s copyright notation as a watermark in Java class files will ensure the legal ownership of class files. Our embedding method is indiscernible by program users, yet enables us to identify an illegal program that contains stolen class files. The result of the experiment to evaluate our method showed most of the watermarks (20 out of 23) embedded in class files survived two kinds of attacks that attempt to erase watermarks: an obfuscactor attack, and a decompile-recompile attack.

Software Requirements
· Operating System : Windows 2000/xp
· Language: Java

Hardware Requirements

· Pentium III processor
· 128 bit RAM
· Hard disk according to the required storage

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