Come on Tommy, don't stifle free projects that aim to give players something awesome. Merging these mods into a megamod takes effort too and if there's constant policing on copyright and permissions, people would be too intimidated to ever make anything worthwhile like this mix.
Life is short, always aim to make life more wonderful and enjoyable. None of us have infinite time and energy to get everything. Focus on what matters the most; the content itself.