I have spend many years during my PhD developing a code base and decided to open-source the code when I finished. It's currently under GPL. The code is used by many different research group around the world, and that was my goal; to provide a useful tool for the research community.
Recently I have been contacted by a company that wants to use the software. My intention was always to charge a fee for industrial use of the code. On the website, it says something to the effect of "GPL for academic use", "please contact me for industrial licensing".
Firstly, do you think this is reasonable approach? Personally, I don't think that industry should get a free ride from my publicly funded research code.
Secondly, what are reasonable terms, pricing and software license for an "industrial license"?