From WSO Insider Information Blog:
Content Locking Works–This Script Locks It Up Tight!
Imagine creating a page full of content that you intend to give away. But instead of making that content instantly available, people have to perform some sort of action (like fill out an email address on a CPA offer or buy a product) before they are able to access the content. Underground Marketing Script is a content locking script that allows anyone to create gated freebie sites.
Grab this script before they increase the price tag on it!
http://wsoinsiders.com/go/underground-marketing-script/
Put the internet to work for you.