EULAs sucks, but summaries probably won't really work. When iD software released the source for the Quake 1 tools (the bsp/light/vis/quakecc, not the game engine!) I emailed them some questions, including some along the lines of "why do you need such a long eula, and couldn't you include a short summary of it?" - the reply I got back was along the lines of them not really liking the legalese, but that it was necessary - and that a summary might risk invalidating the EULA.