What Is the Licensing for Reverse‑Skill? MIT, GPL v3, and Third‑Party Terms Explained

The reverse‑skill project uses a dual‑licensing model: MIT for the core codebase and GPL v3 for the CTF‑Sandbox‑Orchestrator sub‑module, with external tools governed by their original licenses.

Understanding how open‑source licenses apply to reverse‑skill is essential for anyone integrating, modifying, or redistributing code from the zhaoxuya520/reverse‑skill repository. This guide breaks down each licensing layer, explains compliance requirements, and provides practical code snippets to verify license terms programmatically.

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Core Reverse‑Skill License: MIT

The MIT License governs all files at the repository root. This permissive, OSI‑compatible license allows unrestricted reuse, modification, and distribution with minimal attribution requirements.

According to the source code, the main LICENSE file at the repository root contains the full MIT license text. The README explicitly confirms this status:

"This project (reverse-skill) is primarily licensed under the MIT License (see LICENSE)."

Key MIT License characteristics for reverse‑skill:

• Commercial use permitted
• Modification and distribution allowed
• No copyleft requirements
• Requires preservation of copyright notice and license text

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CTF‑Sandbox‑Orchestrator License: GPL v3

The CTF‑Sandbox‑Orchestrator sub‑module operates under GNU GPL v3, a strong copyleft license. This imposes stricter obligations on derivative works.

The GPL v3 license file resides at CTF‑Sandbox‑Orchestrator/ctf-sandbox-orchestrator/LICENSE. As stated in the README: "CTF‑Sandbox‑Orchestrator/: GNU GPLv3".

GPL v3 implications:

• Any modified versions distributed must also carry GPL v3
• Source code must be provided to recipients
• Tighter integration with proprietary code requires careful license compatibility analysis

If you only use the core reverse‑skill library without touching the CTF sandbox component, standard MIT rules apply. Modifying or redistributing the orchestrator sub‑module triggers GPL v3 obligations.

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Third‑Party Tool Licenses

Reverse‑skill integrates with external security tools including jadx, frida, nmap, and BurpSuite MCP. The repository does not embed their source code—it merely orchestrates these tools.

Each integration remains subject to its original license terms. Consult each tool's official documentation for precise compliance requirements.

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How to Verify Licenses Programmatically

Use these code examples to inspect license files without manual browsing.

Display the MIT License Locally or Remotely

import pathlib
import requests

repo_root = pathlib.Path(__file__).parent.parent
license_path = repo_root / "LICENSE"

if license_path.is_file():
    print(license_path.read_text())
else:
    url = "https://raw.githubusercontent.com/zhaoxuya520/reverse-skill/main/LICENSE"
    print(requests.get(url).text)

Check Source Files for MIT Headers

#!/usr/bin/env bash
FILE=$1
if grep -q "MIT License" "$FILE"; then
    echo "✅ $FILE includes MIT license header"
else
    echo "⚠️ $FILE missing MIT license header"
fi

Fetch the GPL v3 Sub‑Module License

curl -s https://raw.githubusercontent.com/zhaoxuya520/reverse-skill/main/CTF-Sandbox-Orchestrator/ctf-sandbox-orchestrator/LICENSE \
| head -n 5

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Key Licensing Files in the Repository

File Path	Purpose
LICENSE	Full MIT license text for core reverse‑skill
README.md	High‑level licensing statement with sub‑module links
CTF‑Sandbox‑Orchestrator/ctf-sandbox-orchestrator/LICENSE	GPL v3 license for the sandbox orchestrator
RULES.md	Operational constraints complementing license terms

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Summary

• Core reverse‑skill: MIT License—minimal restrictions, maximum flexibility
• CTF‑Sandbox‑Orchestrator: GPL v3—copyleft obligations apply to derivatives
• External integrations: Original tool licenses govern usage
• License verification: Use Python or Bash scripts to programmatically inspect LICENSE, README.md, and sub‑module license files

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Frequently Asked Questions

Is reverse‑skill safe for commercial use?

Yes. The MIT License covering the core codebase permits commercial use without restriction. However, if you incorporate or modify the CTF‑Sandbox‑Orchestrator component, GPL v3 terms require distributing source code for derivative works.

Do I need to open‑source my project if I use reverse‑skill?

Not for the core library. MIT‑licensed code can remain proprietary. GPL v3 obligations only activate when you modify or distribute the CTF‑Sandbox‑Orchestrator sub‑module or create combined works with it.

Where are the license files physically located?

The LICENSE file at the repository root contains the MIT license. The GPL v3 license sits at CTF‑Sandbox‑Orchestrator/ctf-sandbox-orchestrator/LICENSE. The README.md at lines 28‑34 provides the authoritative licensing summary with direct links to both.

What licenses apply to jadx, frida, and other integrated tools?

Each external tool maintains its original license. Reverse‑skill orchestrates but does not embed these tools, so their licenses are not transferred. Verify compliance directly with each tool's official documentation before redistribution.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}