in reply to Professional Employees and Works for Hire
Assuming you have a good rep at this company, are they really willing to risk losing you to stop you from doing this? It sounds like one of those lawyer-driven things that the people who actually appreciate your work there would not stand for if they knew about it.
Anyway, I think you can find much more open source friendly jobs right here in NY. I interviewed at a couple of places that did lots of perl and were well aware of the relationship their employees have with the rest of the perl community.