This is standard copyright stuff, as practiced in major open source projects. Stop by Debian-legal or Fedora-legal for a while.
But copyright is a sideshow. I put my time and effort into this, and it certainly discourages further work when people have so little care for the work of others.
Well, speak for yourself. I'm discouraged by your hostile reaction to something that was obviously INTENDED to be helpful rather than harmful. You ignored my earlier post which I thought was fairly substantive so I guess I won't bother to write much more. Thank you for producing this reference document. I will repeat one question from my earlier post: are you willing to contribute this documentation under a license such that it can actually be used by the bitcoin project?