> ## Documentation Index
> Fetch the complete documentation index at: https://developers.openalex.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Licenses Overview

> All license values in OpenAlex

Licenses describe the terms under which open access works are available. They are assigned to individual work locations.

## Values

| ID              | Display name        |
| --------------- | ------------------- |
| `apache-2-0`    | Apache License 2.0  |
| `cc-by`         | CC BY               |
| `cc-by-nc`      | CC BY-NC            |
| `cc-by-nc-nd`   | CC BY-NC-ND         |
| `cc-by-nc-sa`   | CC BY-NC-SA         |
| `cc-by-nd`      | CC BY-ND            |
| `cc-by-sa`      | CC BY-SA            |
| `gpl-v2`        | GNU GPLv2           |
| `gpl-v3`        | GNU GPLv3           |
| `isc`           | ISC License         |
| `mit`           | MIT                 |
| `other-oa`      | other open access   |
| `public-domain` | public domain (CC0) |

Use these values with the `license` filter on works: `filter=primary_location.license:cc-by`