The RLM license server can produce detailed logs of license usage and activity. By default, report logging is turned off, but you can turn on report logging by adding a REPORTLOG line to solidangle.opt:
The value of REPORTLOG is the full path to a log file. The plus sign means that the log is in append mode, and is not overwritten when you restart the ISV license server.
A typical report log will show you the sequence of license check outs and check ins, like this:
You can read more about the report log format in the Reportlog File Format appendix to the RLM License Administration Manual.