# Watermark

> Watermark reference — visible and invisible watermarking, steganography, copyright protection, detection. Use when implementing watermarks for images, documents, or media, or understanding digital rights management.

- Skill: `bytesagain/watermark` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add bytesagain/watermark`
- Raw SKILL.md: https://api.skillmd.com/api/skills/bytesagain/watermark/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: bytesagain (https://skillmd.com/u/bytesagain)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/bytesagain/watermark

---


# 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`

```bash
scripts/script.sh intro
```

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

### `visible`

```bash
scripts/script.sh visible
```

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

### `invisible`

```bash
scripts/script.sh invisible
```

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

### `web`

```bash
scripts/script.sh web
```

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

### `document`

```bash
scripts/script.sh document
```

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

### `ai`

```bash
scripts/script.sh ai
```

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

### `attacks`

```bash
scripts/script.sh attacks
```

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

### `checklist`

```bash
scripts/script.sh checklist
```

Watermark implementation checklist for different use cases.

### `help`

```bash
scripts/script.sh help
```

### `version`

```bash
scripts/script.sh version
```

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