Do you have to have a license to sell?

no

If you want to Sell or Buy a Copyright head over to
http://copyrightbid.com
where you can Buy and Sell Copyrights in an Auction style !

It's 100% FREE to sign Up, Post your Copyright for Sale and the site contains a "Transfer of Exclusive Rights Form"!

It is also free for Buyers to sign up to purchase copyrights.

Copyrightbid.com is the #1 Source for Buying and Selling Copyrights!