One software license is required per named user.
Run-time royalty free.

Single Named User License - Licenses an individual named user.
Team License - Licenses up to 4 Named Users within the same Organization.
Site License - Licenses an unlimited number of Named Users within the same Organization at a single geographical address.

All licenses include 1 Year Subscription providing technical support and product updates.

Subscription is renewable on an annual basis. If you do not renew the subscription then you will still be able to use the software but you will no longer be entitled to technical support or product updates.