Wordpress Membership Plugin

I am wanting to get a wordpress plugin done that I can resell to others. So it would NEED to be protected by a license key that can restrict it to a single domain name. Here are the features that I am looking to have in the membership plugin for wordpress. - Drip-Feed, Time-Released, Sequential access to Files and Blog posts. Configurable Drip-Feed Access to Files/Posts/Pages based on: * Days (since purchase), * Date (specific date, like Feb 14, 2009) * No. of Clicks/Views (Pay-per-view or Pay-per-download) - Supports Recurring Payments as well as One-Time Purchases - Shopping Cart that directly supports [login to view URL], Paypal Express Checkout and Paypal Payments Pro. No need for 3rd party shopping carts. DAP itself becomes your Shopping Cart. - 1-Click Upsells & Downsells - Display One-Time Offers (OTO's) after purchase. - Built-In Affiliate Program with Pay-Per-Lead and Pay-Per-Sale - Admin Screens built right into your WordPress Admin Dashboard. Manage everything from right within WordPress. - Unlimited Users -Unlimited Affiliates -Unlimited Email Autoresponders -Unlimited Email Broadcasting (Bulk-Mail) -Sneak-Peek: DAP will show all content from your blog posts, but only up to the “More” tag. So when Google’s spider (or your visitor) arrives at your blog after you publish a new post, it/they will see a summary of the post, instead of being redirected to a login page. This is extremely powerful from an SEO perspective. -Protects Regular Files: .mp3, .zip, .flv, .zip, .exe. .pdf, .doc. .xls, .mpeg. .swf, .js. This is HUGE as you will never need another download protector ever again. -Fully Compliant Aweber Integration through Aweber's Email Parsers - Customizable Content & Email Templates If you have already created a membership plugin for wordpress, then please provide me with the demo of it so I can check it out. I would be willing to go based off one of those with the extra added features that I am needing to it. Good luck bidding!