Hmm interesting one this. Did he make a business out of it, ie selling it to the airforce after they approved use or did he just let them use it.
This is the deal. If I "develop" a new product or piece of kit for my company to use, even if it is in my own time but is then employed by my company I think it becomes theirs in all the rights so if I then refuse to let them have the original plans I can get kicked.
Personally I think he should have just handed over the source code or maybe worked out a deal. It seemd an airforce specific program anyway.
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