The website might do well to make it clearer that the licenses are per computer.
The license is per user. Here’s the FAQ entry about it: http://www.rainlendar.net/cms/index.php?option=com_easyfaq&Itemid=26#faq30
Ah. Thank you for the information. I continue to think that the information could be displayed a little more prominently - but perhaps I am wrong.
Also: I notice that when I installed the license I was asked to refresh Rainlendar - even though the refresh seemed to happen automatically.