e.g. The Soviet spies stole the plans for the hydrogen bomb.
(Well, unless you're talking about getting the courts to tell the original owner it's yours instead. Which has been at least attempted a few times.)
See definition 1d.
'gunna'. Is it still wrong?
--original comment--
Common usage does eventually lead to validity, though. Language is not static and evolves through usage. Besides, how are you going to measure validity? Is the OED the sole arbiter of what's "correct"? Common usage and mutual understanding is a great way to determine what's "correct" in a language.
I won't debate the legal usage of the word, as there was no mention of legal interpretation by the courts in the previous comments. However you are correct from a legal perspective where words have specific meanings.