The WPSSO and NGFB plugins for WordPress are licensed based on the WordPress Site Address. Typically, a Development, Staging, and Production website – for example – would require 3 licenses. In the spirit of helping our fellow developers, we are offering a free license for every license purchased – on all past and future purchases. So, for example, if you purchased a license for example.com (or www.example.com), you can also register dev.example.com using the same Authentication ID. This allows developers to purchase a license, develop a customer’s website, and then change the Site Address upon delivery, without having to purchase an additional license for the production website.
The developer special also applies to multisite licensing — if you have 2 licenses for example.com/one/ and example.com/two/, you could also register dev.example.com/one/ and dev.example.com/two/ using the same Authentication ID. The installation order is not important – you can register a Development site first, and the Production site afterwards.
In summary, example.com, www.example.com, and dev.example.com are all considered equal for licensing purposes (they share the same license). All other WordPress Site Address values, like test.example.com, staging.example.com, etc., must be licensed to use the Pro version.