Thanks for the other hints; about the "free"

c) Why is the program contacting an "authorization server"
See http://www.hotkeynet.com/phpBB3/viewtopic.php?f=3&t=9

does that mean it can stop being free at any time - and/or stop working at any time ?
Eventually I plan to start charging for the program, but not until the number of users gets to a certain point. At the rate the number is increasing, it will probably be free for at least another year.

The program has more than one authorization server. If it can't contact one it contacts another. The authorization servers are located in different data centers and operated by different companies, so it's very unlikely that they will all become unreachable at the same time.
While it is obviously your privilege to do whatever you want with your work, you may want to clarify this somewhere clearly on your site as the current "HotkeyNet is free multiboxing software" is a bit misleading if you plan on starting to charge and disable the program for people - hooking people with "free" and once they have a significant investment, force them to pay looks a bit like bait and switch... It's also not clear it's a time limited beta (if that's how I should understand the 30 days mentioned in the thread above)

Also in the forum post you reference it says :
By the way, in case anybody is worried about security problems, the only info that HotkeyNet sends to its server its version number.
Yet 60 characters seems like a looong base64 chunk for just a version ?