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The sane version is the one defined as the PDF/A ISO standard. Stuff like pulling remote resources, embedding executable code, etc are all forbidden.

https://en.wikipedia.org/wiki/PDF/A




I didn't realize that this standard existed. Thanks for the link, that's very helpful to know. I've always viewed "modern PDF" as an ad hoc thing defined by the intersection of whatever was supported by the popular free renderers.




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