Flutterby™! : Security Through Obscurity

Locks and LockPicking as Security Through Obscurity - Good light article with a lot of useful links like: LockPicking 101.

I was actually taught basic locks and lockpicking in the USAF in order to get past locks on equipment cases, useful when you need to fix something that the vendor does not want you to be able to fix. The locks were minor, and if you bypassed a lock to replace a fuse, battery or more, the vendor could claim you were not authorized to fix it and they were no longer liable. It was usually easier to get past the lock than "tamper resistant" special screws.