[lukev]

Yes. I used to work for the government, and the question came up on several occasions whether it was permissible to download GPL software, make a few tweaks to suit our needs, and then use it only internally without releasing it. I never got a good answer.

[icebraining]

Well, I can tell you it was. The GPL only forces you to distribute the code to whoever got the binaries, and employees don't count. So internal distribution is pretty much "do what you want".