After a succesful purchase 2checkout.com can transfer control to the Linklok script on your server making use of their MD5 based secret word. Linklok will then display the download link(s) for your products and also email them to the purchaser. These links do not show the true location of the file on your server so there is no way to bypass Linklok. Links can be set to expire between 1 minute and several years later if required (or never expire).

Features:
- Simple to install
- Uses PHP.
- Does not require MySQL or other database system.
- Does not require cookies to be enabled.
- Fully supports 2checkout V2
- Will create secure links for product download only if called from 2checkout.com
- Download links can be set to expire after fixed time period
- Links can be IP address locked
- Nobody ever knows the actual server location of the download files - not even the purchaser!
- Supports unlimited products
- Supports multiple products in one order
- Supports multiple files per product (product combos)
- Uses MD5 security
- Sends email to purchaser with secure download links
- Emails can be in text or HTML format
- Built in or user defined templates for email sent, download links page and error pages
- Can optionally flag orders using free email addresses for manual handling
- Can optionally only provide links via email ensuring valid email address
- Handles checks with option to delay orders while funds clear
- Email and download page templates can be product specific
- Supports physical products
- Can generate software unlock keys or serial numbers from a list, using a user provided algorithm, Clicklocker or by using Software Passport.
- Can protect access to a html or PHP page instead of a download
- Product specific template segment system
- Sell your Software Passport (Armadillo) protected software with 2Checkout as well as Digital River.
- Manual order form feature allows links to be sent manually.
- Supports download resume and down