Adobe also experimented with ads in PDF files, but shut down the beta program after just a few months. Are there some unsolved problems preventing anyone from

Adobe also experimented with ads in PDF files, but shut down the beta program after just a few months. Are there some unsolved problems preventing anyone from doing this successfully? http://hansakoch.com/cancelled-yahoo-ads-for-adobe-pdf-beta-program/ http://hansakoch.com/cancelled-yahoo-ads-for-adobe-pdf-beta-... Perhaps it's too obvious, but there's always the HTML format, published on the web, with ads provided by Google Adsense et al.