You can buy different types of licenses.
This license enables a single, specific individual to use a Rational® software product. Purchasers must obtain an authorized user license for each individual user who accesses the product in any manner. An authorized user license cannot be reassigned unless the purchaser replaces the original assignee on a long-term or permanent basis.
This license is for a single software product that can be shared among multiple team members. However, the total number of concurrent users cannot exceed the number of floating licenses you purchase. For example, if you purchase one floating license for a Rational software product, then any user in your organization can use the product at any time. Another person who wants to access the product must wait until the current user logs off.
To use floating licenses, you must obtain floating license keys and install them on a Rational License Server. The server responds to user requests for access to the license keys. It grants access to the number of concurrent users that matches the number of licenses that the organization purchased.
The token-based license model means that you can buy some token licenses.
Token-based licenses can be used with floating licenses only. They cannot be used for authorized user license