3
If you got this as a single package, then would you mind sending us back a copy of the source files you got ?
According to the GPL, as James said, they don't have the rights to restrict people on their own additions, so it would be nice to be able to check what they changed and see if we can't make everybody benefit from those changes.
It would be a fair return.
Any intelligent fool can make things bigger, and more complex. It takes a touch of genius, a lot of courage, to move in the opposite direction.
Two things are infinite: the universe and human stupidity; and I'm not sure about the 1st one (A.Einstein)