Make your own. So it fits all your specifications exactly. Because its yours
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Oops, wrong thread. Is this a keylogger that's hidden from the user and is started up everytime the user reboots?
Which is paid for, right? I think lawyers are abusively expensive, 2-10 grant for writing something that simple is too much, IMO.
Just make sure you use a port high up in the range, dont use raw sockets, at least dont when you dont have the privs.
Use UDP , make sure its not constantly running, use intervals , say every 5 minutes.
Only make it active during certain hours or at "random" according to a algo known at both sides.
Do I need to say more
I have a totally sick idea for doing this but I want to code it myself first, when there is time.