Document security handler revision

Returns the PDF security handler revision used by the document:

Usage

pdf_doc_security(doc)

Arguments

doc

A pdfium_doc from pdf_doc_open(), or a character path.

Value

Integer scalar. NA for unencrypted PDFs; one of 2, 3, 4, 5, 6 otherwise.

Details

• NA — unencrypted (PDFium reports -1, mapped to NA here).

• 2 — original 40-bit RC4 (PDF 1.1).

• 3 — 128-bit RC4 (PDF 1.4).

• 4 — AES (PDF 1.6).

• 5 — AES-256, Adobe Extension Level 3 (PDF 1.7).

• 6 — AES-256 (PDF 2.0).

Wraps FPDF_GetSecurityHandlerRevision. Useful when classifying PDFs as "encrypted vs not" and when reporting the encryption strength to downstream tools — combine with pdf_doc_permissions() to know whether a viewer would let a user print/copy/edit.

See also

pdf_doc_permissions(), pdf_doc_user_permissions().