Carbon Copy - Business Letter

Do the recipients of a carbon copy of a business letter get a photocopy of the letter after it is signed or before? In other words, does the carbon copy contain a signature?

Thank you!

[Anglika]

Originally they only received a carbon copy of the letter, without signature. These days, since most people print their letters from a computer, the cc will be printed and may or may not be signed, according to the office's practice.