The info is already available on forums, but because I already encountered this in several environments I am posting this on my blog.
There is a known bug in System Center Orchestrator 2012. When the Orchestrator server loses its connectivity with the SQL server, you get the following message: “License expired”, even though the product is licensed.
The solution is restarting the runbook service on that server. If the issues persist, it is possible to open a call with microsoft to receive a hotfix. The fix should be included in SP1 which has nog official release date yet but is expected to come Q4 2012 or Q1 2013.