Hi, Content locking: It is a very effective way of making profits via CPA Networks.
As a publisher you'll be able to create multiple forms of content locking gateways by becoming a member of a incentivized CPA networks.
I would like to share with you for free my favourite CPA networks that allows incentive, has a content locker and instant approval:
Tracking: Voluum: The most technologically advanced tracking solution in the universe. Expand your affiliate marketing campaigns to the next level.:
http://goo.gl/5k6JgY