The DVD is sold as a single user license and can be used by only one person at a time. We do allow installation on two separate computers, typically one for work and one for home. Each will require separate authorizations.
Should you need to move your software to a new computer, we can help you by removing the outdated authorization allowing space for the new installation. Contact us at firstname.lastname@example.org or call 603-641-3900 for assistance.