Digital Curriculum license keys are designed for 1 user per 1 license. Two people would not be able to login with the same license at the same time. For example, while you are logged-in and using the Digital Curriculum, if a co-worker on another computer logs-in with the same license, you would be automatically logged out. One license key should be assigned to one person for the best experience.
License keys are good for 12 months and can be renewed.