A Practical Method for Watermarking Java Programs

  • Authors:
  • Akito Monden;Hajimu Iida;Ken-ichi Matsumoto;Koji Torii;Katsuro Inoue

  • Affiliations:
  • -;-;-;-;-

  • Venue:
  • COMPSAC '00 24th International Computer Software and Applications Conference
  • Year:
  • 2000

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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 discernible by program users, yet enable 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.