References > Creo™ Schematics Installation and Administration Guide > Appendix > License Management Software > License Types
  
License Types
Depending on the PTC product, a license can be one of the following types.
Node-locked licenses—Restricts the use of the software to a particular machine (independent workstation).
Floating licenses—Served by the license server and can be used on any machine connected over the network. There are two different types of floating licenses:
Single server licenses—Configured for a single machine as the server.
Triad licenses—Configured for a set of three machines on the same network that work together to manage a pool of floating licenses. This configuration provides redundant backup in case of a server outage. An identical license file is used for each Triad partner.
Extended license—An extended license makes floating licenses available for locked modules.
Borrowed license—A borrowed license allows you to work temporarily on your machine without being connected to the license server. Refer to License Borrowing for details.
Based on the duration for which you can purchase a license, licenses are classified as the following types:
Perpetual license—A permanent license that you do not need to renew once you purchase it.
Subscription license—A license that is valid for a fixed period. Once the license period expires you can renew the license for an additional fixed period.
For more information on the additional license types that are supported for your product, refer to the product documentation.