PDF becomes an open standard
The International Organization for Standardization published the technical specifications for the Portable Document Format, essentially making the PDF filetype open source. The PDF remains a common format for the political pamphlet, and there is something thematically appropriate, as well as more convenient about the open source filetype.
Now other open source software – and freeware – can create PDFs natively, which makes access across populations of politically active individuals greater.
"ISO for PDF." Digital image. Accessed December 09, 2015. http://www.adlibsoftware.com/~/media/Images/Blog-Media/Images/adlib-bloggraphic-isoforpdf-120820.ashx?h=280&thn=0&w=250.