PDF/A is not typically the standard choice for exporting tools, and it is certainly not a stateless representation of printed documents. PDFs, including PDF/A documents, can and do store extensive metadata, and can include attached files. PDF/A is intended for long-term archiving, not security.

Metadata can be removed, and PDF signing can cryptographically prove a file has not been edited or modified, but it is similarly not typically the standard choice for a conversion tool.