Apple has never asked me for my login credentials, nor did the third-party repair shop I took my MBP to a few months ago. Well, maybe there was a time they did

Apple has never asked me for my login credentials, nor did the third-party repair shop I took my MBP to a few months ago. Well, maybe there was a time they did it that I don't remember, but I'm pretty sure they haven't done it since releasing OS X. (I'm not a frequent user of Apple service, but this MBP has been in the shop four times, I think.) In any case, if they did ask, I would refuse. Let them boot off a DVD if they need to.