Can anyone help me

I need to find a way to stop someone from being able to print from an asccii disk but still read it. My wife is a court stenographer and has software that can make an asccii disk of the transcripe she has done.
how ever we know that the other person she works with askes for these disks and then prints from them and charges the lawyers.
So she doesn’t see any of this money that she worked so hard for. your help would be appreciated.