ACNP Software: Anti Cut and Past Software

[KenR]

This product will help you determine whether others have copied sections of your code into their program. Believe it or not, people don't really tend to steal my code

...The modern software industry has a tradition of copying and pasting source code. This is the single most widely distributed method of producing less-than-perfect programs. Thousands of large and expensive projects contain literally millions of identical or nearly identical fragments of code costing millions of dollars per year for additional support and maintenance. Enter AntiCutAndPaste!

AntiCutAndPaste is designed to search for text fragments that have been copied and pasted in programming language source code or plain text. It is tested on sources from large C++, Visual Basic, Delphi, Java, and C# projects. AntiCutAndPaste will yield surprising results not only with publicly available sources (samples) but also with your own projects (awards). AntiCutAndPaste takes little time to download and is fast and easy to use. Don't hesitate to try it...

http://www.anticutandpaste.com/

from http://www.all4you.dk/FreewareWorld

[mouser]

Note there is a free version of this, which only compares documents you have locally (good for if you are a teacher and want to check for plaigarism amongst the submissions you have received), and a commercial tool which scours internet for duplicate content.