WP-Colophon gives you the ability to add a Digital Colophon into the unobtrusive WEB_AUTHOR meta tag.
What is the SEO Tramp Stamp? A link back to your website in your client’s footer. It's a lazy person's way to get back-links.
What is a Colophon? A statement at the end of a book, typically with a printer's emblem, giving information about its authorship and printing.
What is a Digital Colophon? Similar as above, but for websites. Leave your company name / authorship info in the WEB_AUTHOR tag.
Will using the WEB_AUTHOR help or hurt my SEO? No. This tag is ignored by the search bots.