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encryption.md

File metadata and controls

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Encryption & metadata

Password-protect the output

signed = atick.sign_pfx(
    pdf, pfx=…, password="••••", style=…, placements=…,
    encrypt_password="open-pw",      # user password (to open the PDF)
    owner_password="owner-pw",       # optional owner password (defaults to the user password)
)

The output is AES-128 encrypted; the signature stays valid (the /Contents is exempt from encryption, so the byte range still verifies).

Sign an encrypted input

signed = atick.sign_pfx(pdf, pfx=…, password="••••", style=…, placements=…,
                        open_password="the-input-password")

Decrypt a PDF

plain = atick.decrypt(encrypted_pdf, "the-password")

Set document metadata

out = atick.set_metadata(
    pdf,
    title="Agreement",
    author="Axonate Tech",
    subject="Service contract",
    keywords="contract, signed",
    application="My App",
    created="D:20260610120000+05'30'",
    modified="D:20260610120000+05'30'",
)

Set metadata on an unsigned PDF before signing (changing metadata after signing would invalidate the signature).