[Commons-l] Cool tool that lets you check for copyright renewals on books

[Platonides]

Supppose you enter in the house of a (presumed) burglar. You see he has 
a key-copy machine and thousands of keys. He wants you to save for him a 
copy of some of them. Wouldn't you at least ask him where are these keys 
for or if he has authorization to have a copy of them?