I read most the article. Having been in print in the past I remember how PDFs are the primary document format the world over. And that it got so big that Adobe licenses off the format to a legal firm that manages it for them. I remember there being something about a PDF2 format being implemented behind the scenes that most people aren't aware of.

PDF2 is capable of a lot more and is more efficient. However most of that increased capability is used for control and monitoring.