1. You are not using the latest Adobe Reader (you can download it from the Preserving Gaming History home page)
2. You have the latest version but are viewing in "print preview" mode. The documents have an invisible watermark for protection. It is visible in print preview mode. In the latest version, on the left hand side menu for bookmarks etc., print preview is the top icon and regular view is the one beneath it. Seems a bit ass about face but thats the way it is. 1st time you use the new reader I believe it defaults to the top one. Its fine after that.