ntop is distributed under GPL2. However, if you like and use ntop, we would appreciate
a small donation to the project using the follwing URL:

http://shop.ntop.org/

This is necessary because we get no founding at all I have to purchase myself
books, hardware and software for better developing ntop and improving ntop.

Thanks for supporting ntop!

Cheers, Luca Deri <deri@ntop.org>