PDF/A is a pdf specification from Adobe that is intended
for archival use and rendering far in the future (fonts are
embedded in the output, etc.).
Maybe they state that, however as long as there is no reader that is working on the newest hardware this is just wrong.
And the Specification for PDF/A-1 - PDF/A-3 (a,b,u) is really really long and hard to implement correctly. I doubt that 70% of the solutions (even for money) incorrectly parses the spec.
Actually I doubt that only Adobe Acrobat (Reader) would actually print a 100% correct PDF/A-3a file to the screen.
And the Specification for PDF/A-1 - PDF/A-3 (a,b,u) is really really long and hard to implement correctly. I doubt that 70% of the solutions (even for money) incorrectly parses the spec. Actually I doubt that only Adobe Acrobat (Reader) would actually print a 100% correct PDF/A-3a file to the screen.
Actually this is the (inofficial/offical) spec:
It should be really close to the iso one (http://www.iso.org/iso/home/store/catalogue_tc/catalogue_det...)