On Sat 11 Feb 2017 at 02:11:38 (+0100), Michael Lange wrote: > 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? > > > > > > How can I as a creator specify that you as the reader MUST use a > > specific program to read them? > > Maybe by adding a "feature" that is supported by your reader software > exclusively?
For example, https://en.wikipedia.org/wiki/Portable_Document_Format#XML_Forms_Data_Format_.28XFDF.29 https://en.wikipedia.org/wiki/XFA#Usage_with_Portable_Document_Format Cheers, David.
