If you are going to start using DRM, I recommend
http://www.pay2play.net/
It is run by Ifriends. If you have a performer or studio account, you keep 100% of the money from your sales. If you aren't, you only pay a 5% per sale fee. It's the best DRM solution for content producers I have found on the web. Yes I have been using it for years and have cashed the checks from it.
They also have an affiliate program you can use to help sell your clips. It's all explained at the site. But I'm happy to answer any questions here.