Most modern office and design software have built-in tools to "Save As" or "Export" to PDF/A.
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[List any sources, prior documents, or related archive identifiers.]
Digitization projects (like Google Books or university libraries) use PDF/A to ensure that rare manuscripts and historical records are preserved against technological obsolescence.
I've put together a proper for you. This includes a full table of contents, archival metadata, and standardized section formatting suitable for long-term preservation.
Archive PDFs cannot be password-protected or encrypted, as the keys could be lost over time, making the data inaccessible.
The original 2005 standard based on PDF 1.4. It is the most restrictive but the most widely compatible.