The GNU Public License protects Electric (it can be found in the file "COPYING", in every source module, and in the "About" dialog). The short description of this document is: (1) you get the source code for free (2) you can make money with it in any way possible (sell it, sell chips made with it, etc.) (3) if you modify it in any way, and then sell the system, you must make those modifications (source code) available to anyone who asks. If this description is not accurate, it is because I am not a lawyer (I only play one on the web). Consult a real lawyer to find out what your limitations actually are.