What the other person is saying is that the ACQ should be seeing a lawyer and making SWF pay for the lawyer to figure out a license.
Your involvement is the maintenance part. You owe your buddy big time, that's fine, but from the sounds of it, you aren't a lawyer. Don't do lawyer stuff. Let the lawyers do their thing and you do your maintenance work.
SWF should also have their lawyer draft a contract for your involvement which you will be able to sign to be able to do the work.
We're telling you dude, cover your ass. You don't want to end up on the wrong side of a law suit just because you were doing your part.