From this note on the php|architect site today, there's a note from the PHPAudit folks that their product is now availible for free.

PHPAudit, a licensing and distribution system for PHP developer, is now available for free.

With PHPAudit being available for free, any developer can protect their products prior to release completely avoiding piracy and many other associated issues.

PHPAudit provides a shopping cart ordering system allowing users to order your products. A member’s area is also provided allowing customers to download your product, manage their licenses and pay any invoices.

There's tons of other features as well in this license administration package, and the Lite version has it all. The only limit on it is that it tops out at 15 licenses...