It’s just a simple program that scan all deb packages installed on the machine and notify you if there’re some of the packages which isn’t free.
The funniest part is the program’s name, it’s an abbreviate from Virtual Richard M. Stallman.
While I don’t really think any End-User will be care about software license at all. (They even pirated some.) Top-Down free software subsinary is on the way. Large corporation in Thailand has started to deploy OO.o in scale of thousands machines. I’m sure we’ll see a lot more very soon.