Whitelabeling refers to a merchant allowing an affiliate to sell products under their own brand with no mention of the actual merchant. Visitors to the affiliate's website would likely believe it was the affiliate who was actually selling the items or taking the leads since there is no mention of an outside merchant. This typically occurs by the merchant creating a website branded solely to the affiliate on their own server under their control and allowing the affiliate to “mask” that website as appearing to be a subdomain on the affiliate website. Many times merchants limit Whitelabeling opportunities to only being available to Super Affiliates.
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.