Updated by Kelly Malloy on Jul 17, 2013
There are several "different" OpenVPN products available. Some of them use completely free open source libraries and other do use some commercial libraries. CenturyLink Cloud uses software under this license:
What is not free for commercial use is the OpenVPN Access Server. That software contains a GUI for managing connections, creating VPN download bundles, etc. CenturyLink Cloud does not use this software, allowing everyone to be covered under the community supported edition. A comparison of the editions can be found here.