Upload & Sell: Off
| p.1 #3 · I need to protect a graphic background |
If you are talking about an original piece of art (a photo backdrop) which you created yourself, it is protected by copyright. If, as your profile indicates, you are in the USA you can register the work with the Library of Congress and gain additional protection.
However you need to be aware that copyright will only protect the actual image you created and not the idea behind it.