A local dealership.
My brother is an auto mechanic and works at an auto parts store. Our grandmother's car needs work, and my brother was going to take a look at it. He needed a copy of the owner's manual for her car, and since her car is old and unpopular, he couldn't find a manual anywhere but a dealership. He called the dealership from his work phone to purchase a manual. I was lucky enough to listen to his call with the MANAGER of the dealership:
Dealership: I can't sell you a manual.
Dealer: Because you're a competitor.
Bro: What? I work at an auto parts store but I just want to fix my grandmother's car.
Dealer: Well, I can't sell you the manual.
Bro: I don't understand why.
Dealer: You work for a competitor and you're not the owner of the car.
Bro: So? I just want to buy a manual for my grandmother, who owns the car.
Dealer: We can only sell manuals to the person who owns the car.
Bro: If I have my grandmother call to buy a manual, will you sell it to her?
Dealer: No. You could be trying to scam us. You *do* work for a competitor.
Bro: Are you accusing me of lying?
Dealer: You might be.
Bro: So, because I work for an auto parts store, my grandma can't have a manual for her car?
Dealer: That's correct. It's a *car manufacturer* mandate and we can't do anything about it.
Bro: That's bull hockey, I used to work for *car manufacturer* and there's no such rule.
Dealer: I'm still not going to sell you the manual.
Miraculously enough, the dealership in the next town over had no problem selling Bro the manual, and even mailed it to him for free.
It's not like owner's manuals contain trade secrets or anything either.