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watermark

Embed and detect forensic watermarks to trace the origin of leaked copies.

Usage

shadowforge watermark <COMMAND>

Subcommands

embed

Embed a unique recipient fingerprint into a cover.

shadowforge watermark embed \
  --cover <FILE> --recipient <ID> --output <FILE>

detect

Check a file for watermark fingerprints.

shadowforge watermark detect \
  --input <FILE> --tags <FILE>

Examples

# Watermark a document for a specific recipient
shadowforge watermark embed \
  --cover report.png --recipient "recipient-uuid" --output report-wm.png

# Check if a leaked copy contains a known watermark
shadowforge watermark detect \
  --input leaked.png --tags known-recipients.json

How It Works

Each recipient gets a unique permutation pattern embedded via LSB. If a copy is leaked, watermark detect matches it against known recipient tags to identify the source of the leak.