Recommended way to format copyright?
Chicago Manual of Style (13th ed.), section 4.16 says:
...the notice consists of three parts: (1) the symbol © (preferred because it also suits the requirements of the Universal Copyright Convention), the word Copyright, or the abbreviation Copr., (2) a date — the year of first publication, and (3) the name of the copyright owner. Most publishers also add the phrase All rights reserved...
So CMoS goes (mostly) with the first format, namely
"© Copyright YYYY Company"