Watermark

Watermark reference — visible and invisible watermarking, steganography, copyright protection, detection. Use when implementing watermarks for images, docume...

Security Scan

The skill is an instruction/reference pack for watermarking that only ships a local help script and does not request credentials, install software, or perform network activity — its stated purpose matches its footprint.

Purpose & Capability

Name/description (watermarking, visible/invisible, steganography, detection) align with the included SKILL.md and a local script that prints guidance. Nothing requested (no env vars, no binaries) appears unrelated to the stated purpose.

Instruction Scope

SKILL.md instructs the agent to run a local script (scripts/script.sh) with commands like 'intro', 'visible', 'invisible', etc. The provided script is a set of cmd_* functions that print reference material; it does not reference external endpoints, read system config paths, or access environment variables in the reviewed portions.

Install Mechanism

No install spec is present and the skill is instruction-only plus a bundled shell script. This is low-risk: nothing is downloaded or written to disk at install time beyond the existing packaged files.

Credentials

The skill declares no required environment variables or credentials and the instructions/packaged script do not require secrets. There are no disproportionate or unexplained credential requests.

Persistence & Privilege

always is false and the skill does not request persistent/privileged system presence. It doesn't modify other skills or system configuration according to the provided files.

Assessment

This skill is a local reference/help package for watermarking and appears self-contained: it prints documentation from a bundled script and does not ask for credentials or perform network calls. Before installing, you may want to (1) quickly scan the full scripts/script.sh to confirm there are no hidden commands that run external tools or contact remote URLs, (2) consider that steganography and watermarking techniques can be dual-use — be mindful of legal and ethical constraints when applying them, and (3) if you plan to embed watermarking into production systems, prefer well-maintained libraries (Digimarc, Cloudinary transforms, ImageMagick/Sharp) rather than manual shell scripts. Overall this skill is coherent with its description and low-risk, but always review third-party code and repository provenance for additional assurance.

Watermark — Watermarking Reference

Quick-reference skill for watermarking techniques, implementation, and digital content protection.

When to Use

• Adding visible watermarks to images and documents
• Understanding invisible/digital watermarking for tracking
• Implementing CSS/canvas watermarks in web applications
• Protecting intellectual property and detecting unauthorized use
• Understanding steganography and content authenticity

Commands

intro

scripts/script.sh intro

Watermarking overview — types, purposes, visible vs invisible, history.

visible

scripts/script.sh visible

Visible watermarks — design principles, placement, opacity, tamper resistance.

invisible

scripts/script.sh invisible

Invisible watermarks — frequency domain, LSB, spread spectrum, robustness.

web

scripts/script.sh web

Web watermarking — CSS overlay, canvas-based, DOM watermarks, anti-removal.

document

scripts/script.sh document

Document watermarking — PDF, print, forensic tracking, canary traps.

ai

scripts/script.sh ai

AI watermarking — C2PA standard, AI-generated content marking, detection.

attacks

scripts/script.sh attacks

Watermark attacks — removal, distortion, collusion, and countermeasures.

checklist

scripts/script.sh checklist

Watermark implementation checklist for different use cases.

help

scripts/script.sh help

version

scripts/script.sh version

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