How get info about computer app is running on?

I am making an application that will have a license for running on only one computer at a time. I will have a license file that will hold info about the app, its version, etc. But I also want to put info about the computer that it's being installed on (none of that info will be sent to me, just saved in the license - enrypted - so the license can't be used on a diff computer). I do NOT want the OS name and version (they can change that) but the actual computer info.
I know some C/C++ programs can do this, but is there any way to get this info from java? Does anyone have any sample code or even just suggestions of places to look for this information? It'd be greatly appreciated!
Thanks in advance!

I know it's not a perfect solution - yes someone could
decompile it, but how many people do that or know how
to do that? Well, most semi-decent Java programmers know how to do that. Then they'll decompile and crack it and distribute it, provided that your
program actually is something good.
While doing what I suggest wouldn't stop
100% of the users from pirating my software (which I'm
attempting to make a living off of), it would stop
MORE than if I didn't do it.Probably it'd annoy more potential customers. It's a very bad idea to piss off the customers.
As for changing the HD, or even the computer it's on,
that would be totally possible. The app is equipped
with a way to invalidate the license so it won't work
on that computer, and contact my site to invalidate
the public key and then allow them to redo it on
another computer/HD. It all would take only about 2
minutes actually, so it's not even an inconvenience.As a potential customer I'd have to disagree.
I see no problem with that.Yes, but you're the author not the customer.
Do you or anyone else know of a way to do this, even
if not through Java, in C (JNI) or C++?Through JNI it's possible naturally, but I don't know the specifics.
The reason
it's a big deal is this: for a company like MS if only
20% of the users of their product actually pay for the
product, they're still making millions. If only 20% of
the users paid for mine, I wouldn't even have enough
money to live for 3 months!Get a job? :) Sorry, but seriously having copy protection isn't really going to make a difference. If your product is really good it will get cracked, if it's a specialized piece of software that won't be circulating in the mainstream, then a simple license check would suffice.

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