The software license is perpetual, which means that the software will continue to run forever, as long as you are using the same version, and also reinstall the same version when reinstalling your operating system or when moving the software to a different computer.
After your maintenance contract expires, you can not upgrade the software to a newer version, or install a newer version on another computer.
Without a valid maintenance / support contract it is also not possible to receive any form of technical support (which also includes moving your computer bound license to another computer).
