Thanks a lot for your answers.

One questions remains. I asked about if bearshare was close source. It seems its true. So, I wish to know what the gnutella comunity think about the use of the protocol and the network by these close source programs and strong comercial programs (this is a diferrent case, like Morpheus, that is open source but really comercial).

I am thinking about make a client (i said this yet) and about if i wish to make it close or open source.