Most Rational ClearCase applications and commands (cleartool commands, for example, or GUIs such as the Rational ClearCase Explorer) require a license to run. Rational ClearCase can use Rational Common Licensing, which is based on the FLEXlm license management tool from GLOBEtrotter Software, Inc. and ClearCase Licensing, a proprietary licensing scheme.
For more information, see License servers and license administration.