Not that I am a big fan of lawyers, but if you really want to cover your behind, I would recommend consulting with one rather than depending on the advice of Perl users. Legal matters tend to be about as complex as programming matters, and require a similar level of expertise and attention to detail if you want to avoid mistakes. (Also, any non-lawyer here who passes along incorrect legal advice could possibly open him/herself up to legal trouble.)

Disclaimer: I am not a lawyer, so please consult with your lawyer before assuming any of my preceding statements are correct. B^)