This is good, from BoingBoing:

Monolith and digital copyright: BoingBoing reader Jason Rohrer created an app called Monolith, which "munges" together two arbitrarily-selected binary files (called a Basis file and an Element file) to produce a Mono binary file (with a .mono extension). Jason says the resulting Mono file will not be statistically related to either file, hence becoming an interesting tool for exploring the boundaries of digital copyright (what is the copyright status of the resulting .mono file?)