By earning my bread through writing software, I made a pact with the Devil. In seventeen years spent working as a software engineer, I have been required to sign a non-disclosure agreement by everyone I have ever worked for. I have never been allowed to write Free Software. All but a tiny bit of the source code I have written in seventeen years of hard labor is now kept a jealously guarded trade secret by those who paid me to write it. Many of those companies are now long out of business, yet I could still be sued or even imprisoned should I release any of the source code I wrote for them.
So true and probably why there are a lot of people trying to figure out how open source can pay the bills. I'd be one of those as I like sharing my work, but if only it would pay my mortgage.