final or proof

A printer's proof is also called a "reproduction proof", a "retro", or sometimes a "slick". This is the first print made from a typeset, etching, or camera ready copy and is used to check the quality and correctness of the typeset, etching, or camera ready copy.

They are proof readers?

You should always have proof of insurance in your possession, in case you get stopped by the police or have an accident. If you don't have a copy, contact your insurance agent. That information is on the policy.

A certified copy of your marriage certificate is legal proof of marriage under most circumstances.