The SAP license includes most (but not all) source code, and you can change it - but the change is logged,and if it is a change to a SAP supplied program, this can affect support arrangements. Basically, it lets you change what you wish, but you are responsible for your own changes (don't screw things up and then expect the supplier to fix a problem you caused!). I thing Oracle do the same with their ERP products. You might have a look at some of these licences, as they might give you some ideas of what to, and what not to consider, Jim

And in Soviet Russia, if the government banned a book, movie or game, and you managed to get pirate copies for yourself, we would all cheer you on.

The government wouldn't let you buy it, so if you managed to get a copy, who cared if you hadn't paid for it - often even the author and publisher would be cheering you on, for valuing their creation!

But if the author and publisher won't sell it to you, everyone thinks you are a criminal if you manage to get a copy?

Sounds like Valve can actually think, which is more than many rights owners and enforcers.