You can use Checkbox server edition by purchasing a one-time perpetual software license. There are three license options available. Each option allows a different number of Checkbox installations and users. The developer license includes access to our software development kit. The enterprise license includes Active Directory and web farm support.
Our perpetual licenses can be used forever, with no renewal fees. (See our software-license terms & conditions.)
Optional support plans are also available for each license. Support plans include priority product support and a subscription to our regular software updates.