- PDF/A is [...]
Those are all good archival properties! However, it's also R/O.
Maybe if you stick to Adobe's tools. As demonstrated by this thread,
it's entirely possible to modify such files, even if the currently-easy
ways to do that involve a trip through a completely different
representation.
I find it astonishing that anyone would seriously call any documented
file format read-only. (If PDF/A isn't documented, then IMO it's not
suitable for archival under any circumstances. But this thread makes
it sound as though it's documented.)
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