Reading this posting makes me again thinking about writing an open source gnutella proxy in my free time. In the very beginning I hought about firewall solutions and maybe anti-kidporn, but now about filtering out unwanted meta stuff.
I still wanna wait and see how gnutella protocoll gets improved. I hope all sides sit together and launch a new Gnutella RFC.

Sorry I don't agree with the behavior " I'll take a open network protocoll and add some hidden/encypted metadata but no one else should profit or reverse engeneer it, because now it's all mine and this is my bussiness concept". Too aggresive for my taste.