Technical PDF Glossary: ISO Standards & Security

Bates numbering is a sequential alphanumeric indexing and labeling system used in legal proceedings, government investigations, and corporate audits to uniquely identify, retrieve, and cross-reference individual pages across large document productions.

PDF/A is a standardized subset of the PDF format (ISO 19005) tailored specifically for long-term digital preservation. It completely prohibits features that depend on external resources —such as unembedded fonts, encryption, and JavaScript— ensuring the file renders identically decades into the future.

AES-256 PDF encryption is the modern cryptographic standard for securing documents (specified in ISO 32000-2). Utilizing a 256-bit symmetric cipher and 14 rounds of mathematical transformation, it renders brute-force decryption mathematically impossible with modern computational power.

Binary PDF redaction is the forensic process of physically excising confidential text streams, vector paths, and bitmap pixels from a PDF internal object tree, ensuring that redacted information is mathematically unrecoverable by any clipboard or extraction tool.

OCR (Optical Character Recognition) is a computer vision technology that analyzes visual pixel patterns of text inside scanned PDF images and translates them into machine-readable digital characters, generating an invisible text layer that enables search, copy, and indexing.

Zero-Knowledge PDF processing is an architectural design paradigm where all document computations execute exclusively on the user local hardware (via in-browser WebAssembly), meaning the service provider servers never receive, store, or possess any knowledge of the file content.