Nuclear Clock is shareware.  This means that you are offered a free trial period for 30 days, then you must register the software by paying for it.  If you are not fully satisfied with the software after your 30 day trial period, then you may remove it from your system without obligation to purchase.  However, if you did like this software, then please register it. Registration only costs $10 and you can register this program at...

http://www.wakproductions.com/registration/

Registering the software will:

1. Remove advertisements nagging you to register
2. Allow you to keep the program for eternity
3. Get rid of those sleepless nights because you haven't registered
4. Keep the company that made this program writing good software