ATick for Python

The standalone PDF digital-signature library for Python — PAdES & CMS signing with a PFX/PEM file, USB tokens (PKCS#11), the Windows certificate store and Indian eSign, with RFC-3161 timestamps, long-term validation and a green-tick appearance Adobe shows as valid. Zero dependencies.

Install with pip install atick — one self-contained package.

Sign in one call

import atick

signed = atick.sign_pfx(
    open("doc.pdf", "rb").read(),
    pfx=open("my.pfx", "rb").read(), password="••••",
    style=atick.Style(cn="Axonate Tech", reason="Approved"),
    placements=[(1, (300, 55, 575, 175))],
    pades=True, timestamp=True, ltv=True,   # PAdES-B-LT
)
open("signed.pdf", "wb").write(signed)

What's inside

• Sign anywhere — .pfx/.p12/.pem, USB tokens, the Windows store and CCA eSign.
• Full PAdES — B-B, B-T, B-LT, B-LTA with timestamps and long-term validation.
• Certify & lock — DocMDP, field-locking, pre-sign CRL/OCSP checks, encryption.
• Rich appearance — logo or CN, the validity mark, custom text, invisible signatures.

Quickstart →