Which PDF/A profile is this?

The backend writes an archival PDF. If a records office names PDF/A-1b vs A-2u, validate with their checker and re-export if they reject the file.

Can a PDF/A stay encrypted?

Most archive profiles forbid encryption. Encrypt for transit, decrypt for the vault copy, then convert.

Missing fonts, transparency, or attached files are usual causes. Flatten, subset fonts by re-exporting from the source app, then retry.

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