I’ve just released AquaticPrime 1.0, the first open source software license system on Mac OS X. The AquaticPrime package consists of the following things:

AquaticPrime Developer - This is the application which you use manage keys for your products, generate license files, and get license information.
AquaticPrime - This is the licensing library itself, in both framework and static library form, suitable for use in any Cocoa-based application.
Sources - This contains the source to AquaticPrime, in addition to an implementation that uses only CoreFoundation (suitable for use in Carbon applications), as well as an implementation of AquaticPrime in PHP that can be used to generate license files on a webserver.

I’ve also added a developer guide that describes how to use the system. Have comments? Leave them here or email me.