FWIW, PDF is an open standard. There exist both open and proprietary readers and creators. It has been an open standard for nearly a decade. https://en.wikiped

FWIW, PDF is an open standard. There exist both open and proprietary readers and creators. It has been an open standard for nearly a decade. https://en.wikipedia.org/wiki/Portable_Document_Format https://en.wikipedia.org/wiki/Portable_Document_Format