I believe that an AdSense product for PDF files can bring a revolution in the commercial use of the PDF format. It shall allow both experts and semi-experts to publish individual articles as well as full-blown ebooks in the form of well-protected PDF documents laden with advertising code, without worrying about unauthorized copying of their work. In fact, under this model authors will encourage free-distribution of their PDFs to more and more people.
Such a product shall allow website owners to publish select documents in PDF rather than HTML. Use of PDF shall provide the following benefits to the publisher:
- Setting permissions using industrial-strength features of PDF
- Not losing out on the per-document ad revenue available in regular Web documents
- Providing the usual benefits of PDF files - such as a consistent layout, paper-like readability, etc. - to the users
For Google, such a product can mean a new source of cash - whilst making minimum investment - to feed its desire for continued growth.