What Is the License for the Marin Project? Complete Guide to Apache 2.0

The Marin project is released under the Apache License 2.0, a permissive open-source license that grants broad usage rights while providing explicit patent protection.

The marin-community/marin repository uses the Apache 2.0 license to ensure maximum compatibility with both open-source and commercial applications. Understanding the marin project license terms is essential before integrating this codebase into your own projects, as it dictates how you can legally use, modify, and redistribute the software. The license information is explicitly declared in multiple locations throughout the repository to ensure complete transparency.

Locating the Marin License Files

The Apache 2.0 license is documented clearly across several key files in the repository root, ensuring you can verify terms regardless of how you access the code.

Top-Level LICENSE File

The definitive source for the marin project license is the LICENSE file located in the repository root. This file contains the complete, unmodified legal text of the Apache License 2.0. You can view the full license directly at https://github.com/marin-community/marin/blob/main/LICENSE or inspect it locally after cloning the repository.

README.md License Badge

The README.md file displays a license badge that confirms the Apache 2.0 status. The badge syntax appears as:

![License](https://img.shields.io/github/license/marin-community/marin?color=blue)

This visual indicator provides immediate confirmation of the licensing terms without requiring you to parse the full legal text.

Build Configuration Reference

The pyproject.toml file also references the license metadata, ensuring that package managers and build tools correctly identify the marin project license during installation. This configuration file is located at https://github.com/marin-community/marin/blob/main/pyproject.toml alongside other project metadata.

Verifying the License Programmatically

Developers can automate license verification using several methods to ensure compliance in CI/CD pipelines or dependency scanning tools.

Local File Inspection

To quickly verify the license on a local clone, display the contents of the LICENSE file:

cat LICENSE

For a programmatic check within Python applications, read the file using standard library modules:

import pathlib

# Resolve to repository root relative to current script

repo_root = pathlib.Path(__file__).resolve().parents[2]
license_text = (repo_root / "LICENSE").read_text()
print(license_text[:200])  # Display first 200 characters for verification

GitHub API Verification

Query the repository metadata directly via the GitHub API to confirm the SPDX identifier:

import requests

url = "https://api.github.com/repos/marin-community/marin/license"
headers = {"Accept": "application/vnd.github.v3+json"}
resp = requests.get(url, headers=headers)
data = resp.json()

# Returns "Apache-2.0"

print(data["license"]["spdx_id"])

This method retrieves the standardized license identifier that automated compliance tools require to verify the marin project license programmatically.

Apache 2.0 Permissions and Requirements

The marin project license grants specific rights while imposing minimal obligations compared to copyleft licenses like GPL.

Broad Usage Rights

Apache 2.0 permits you to copy, modify, distribute, and publicly perform the code. You may use Marin in commercial applications, private projects, or academic research without paying royalties or requesting additional permissions from the original authors.

Patent Protection Clause

Contributors to marin-community/marin explicitly grant a patent license for any patents necessarily infringed by their contributions. This protects users from patent litigation arising from the use of the codebase, a critical feature not present in all permissive licenses like MIT.

Attribution Requirements

When redistributing Marin or derived works, you must:

• Retain the original LICENSE file and copyright notices
• Include any existing NOTICE file that accompanies the distribution
• Document significant changes made to the original files

The CONTRIBUTING.md and AGENTS.md files outline additional expectations for contributors regarding licensing and intellectual property rights, though these primarily govern those submitting code rather than end users.

Summary

• The marin project license is Apache License 2.0, with full text available in the top-level LICENSE file
• Verification is available via the README.md badge, pyproject.toml metadata, and GitHub API (spdx_id: "Apache-2.0")
• Apache 2.0 allows commercial use, modification, and distribution with minimal restrictions compared to copyleft licenses
• The license includes an explicit patent grant protecting users from contributor patent claims
• Redistribution requires preserving license notices and any existing NOTICE file, but does not require sharing derivative source code

Frequently Asked Questions

What license does the Marin project use?

The Marin project uses the Apache License 2.0. This permissive open-source license is confirmed by the LICENSE file in the repository root, the license badge in README.md, and the GitHub API metadata which identifies it as Apache-2.0 in the SPDX format.

Is the Marin license compatible with commercial projects?

Yes, the Apache 2.0 license explicitly permits commercial use without restriction. You can incorporate Marin into proprietary software, sell products built upon it, and modify the code for business purposes without releasing your own source code, provided you maintain the required attribution notices in the LICENSE file.

Where can I find the full license text for Marin?

The complete legal text resides in the LICENSE file at the repository root (https://github.com/marin-community/marin/blob/main/LICENSE). You can also view it locally with cat LICENSE or retrieve it programmatically using the GitHub Repository Contents API endpoint for the LICENSE path.

Do I need to contribute back modifications to Marin?

No, the Apache 2.0 license does not impose copyleft requirements. You may modify Marin and keep your changes private or proprietary without contributing them back to marin-community/marin. However, if you do choose to contribute, you must follow the guidelines in CONTRIBUTING.md and agree that your contributions fall under the same Apache 2.0 license terms.

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