On Sat, 11 Feb 2017 11:32:45 +1100 Keith Bainbridge <keithrbaugro...@gmail.com> wrote:
> Have I missed something here? > > .pdf files are portable, right? > PDF is a container format, using a Post-Script-like language. PS was originally developed as a page description language for use with laser printers, and PDF evolved from that. > > How can I as a creator specify that you as the reader MUST use a > specific program to read them? > You can define new program extensions. You can't stop other writers from reverse engineering them, but the process is inevitably one of catch-up. -- Joe
