Just a question:
 

I was wondering if a person can block someone specific from uploading from their share file (computer).

If so how?

Thanks,

Trinton

Yes that can be done with peerguardian,
you can manually add ip adresses.
And your protected against various nosy organisations.

http://www.methlabs.org/

Don't know for sure if you can block ip adresses in Bearshare itself, but I think it must be possible as most clients have this feature.