Hi.
Content locking is the practice of locking any content or section on your website and forcing users to complete a short survey to gain access to your content. For example, you can create a widget using a choice of major CPA network, when a user goes to your website to look for information regarding Content "A", and the user click on your Download button, a widget from the CPA network will appear asking users that they have to complete a survey, download a freeware program or complete a trialpay offer, and after they perform that action then your content unlocks. If users completes a short survey they wont have to pay anything, so its free for the user, you get paid about $1 to $10 depending on the survey, the user is happy that was able to download your content and you are happy that you got paid.
The Top Three CPA (Cost Per Action) Networks are:
CPALead AdscendMedia and
AdworkMedia
These networks allows you to lock any specific content or page on your website and forces your users to complete an
Action (that's why its called Cost Per Action or CPA in Short) before the user can get access to your content and you get paid. In my opinion its much better than Adsense and the pay is better. Because there is an incentive to complete an offer, your content, users will be more than willing to complete a survey or offer than, in the case of adsense, mindlessly showing banner ads or text ads and hoping that users clicks at them with no incentive what so ever.