@sir If it was proprietary, I probably have long forgotten what's even going on there and would be of limited usefulness if not contracted for some sensible amount of time to go through the code and recall everything. So unless it's literally just answering some simple questions from the top of my head, won't do their work for free.

If it was copyleft, I'd likely be glad to help, of course provided that I can actually find some spare time for that.