QUOTE(Helmut @ 16.06.2009 11:24)

The license is starting by installation.
The key has a creation date as 2008/06/16. The license is valid for 365 days and a waiting period for 30 days. This value can vary. The final date is 2009/07/16
In your environment you can install the application from 2008/06/16 to 2008/07/16 without loosing a day.
That's immposible because I have a lot of licenses that expires on 2009/18/
09 , and that date is two months later than 365 days since 2009/18/07 (considering it the maximum installation date). In this exactly case, the license appear to be installed(activated) on 2008/10/02.
You can see that on the attached image ( you need to know that in Spain dates are written inverse, that means a date like this on the image : 02/10/2008 , means 2008/10/02 ).
And the question is again : should I renew ALL licenses now? , because I have a difference of THREE months on the expiration date for the same license key, and if you say there's only a month of non-loosing license days, it doesn't make sense...