1. Codeshield java bytecode obfuscator, http://www.codingart.com/codeshield.html
2. Sandmark, http://www.cs.arizona.edu/sandmark/
3. Smokescreen java obfuscator, http://leesw.com
4. klassmaster.,Z.: http://www.zelix.com/klassmaster/index.html
5. Aiken, A.: Moss – a system for detecting software plagiarism , http://www.cs.berkeley.edu/aiken/moss.html