GitHub licence checker

Paste a GitHub repo. You'll see its licence, whether you can use it commercially, what attribution you owe, and any copyleft warning, plus whether JustClaw-It already serves licence-cleared components from it.

mastra-ai/mastra: Apache-2.0 permissive

Source: JustClaw-It's licence policy for this repo (checked against the repo's LICENSE file). Open on GitHub

Commercial use OK?	Yes. Commercial and proprietary use is allowed.
Attribution	Keep the licence, copyright and any NOTICE file; mark files you changed. Includes a patent grant.
Copyleft	No copyleft. You don't have to open your own code.
Copyright holder	2025 Kepler Software, Inc
In JustClaw-It?	no We index this repo but don't serve its code, because its licence class is permissive. Only permissive and weak-copyleft code is served.

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This is information, not legal advice. Licences can differ per file or per release; read the repo's LICENSE and NOTICE files before shipping.

Questions

Can I use MIT-licensed code in a commercial product?

Yes. MIT allows commercial and proprietary use. You must keep the copyright and permission notice with the code.

What does copyleft mean for my code?

Strong copyleft (GPL) means distributing a product that includes the code puts the whole product under the GPL. Network copyleft (AGPL) extends that to software you only run as a service. Weak copyleft (MPL, LGPL) limits the obligation to the licensed files or library.

What if a repo has no licence?

Then all rights are reserved by the author. You can read the code, but you may not copy, modify or ship it without permission.

Stop checking licences by hand. JustClaw-It is an MCP server with 1,533,000+ licence-cleared, quality-scored code components. Search is free; every result carries its licence and attribution.

Remote MCP endpoint: https://justclaw.it.com/mcp (API key auth). Works with Claude Code, Cursor, Codex, Windsurf and other MCP clients. A one-line CLI installer (@justclaw-it/cli) is coming.

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