Third-Party Licenses

Last Updated: March 2025

Open Source Acknowledgments

PenPage is built with the help of many excellent open-source libraries. We are grateful to the developers and communities behind these projects. This page lists the major dependencies and their licenses.

Core Dependencies

Editor

Package	License	Description
@tiptap/*	MIT	Headless WYSIWYG editor framework
prosemirror-*	MIT	Underlying editor toolkit
markdown-it	MIT	Markdown parser

UI Framework

Package	License	Description
react / react-dom	MIT	UI component library
@dnd-kit/*	MIT	Drag and drop toolkit

Utilities

Package	License	Description
dompurify	Apache-2.0	XSS sanitizer for HTML
jszip	MIT	ZIP file creation and extraction

Development Dependencies

Package	License	Description
vite	MIT	Build tool and dev server
typescript	Apache-2.0	TypeScript compiler
playwright	Apache-2.0	End-to-end testing framework

Dual-Licensed Packages

Some packages are available under multiple licenses. We have chosen the following licenses for use in PenPage:

DOMPurify (MPL-2.0 OR Apache-2.0): We use DOMPurify under the Apache-2.0 license.

JSZip (MIT OR GPL-3.0+): We use JSZip under the MIT license.

License Texts

Full license texts can be found in the respective package repositories or at the following locations:

PenPage License

PenPage itself is available under a dual license:

Open Source License (AGPL-3.0)

PenPage's source code is available under the GNU Affero General Public License v3.0 (AGPL-3.0). This means:

You may view, modify, and distribute the source code under AGPL terms
If you modify and deploy PenPage as a network service, you must release your modifications under AGPL
Attribution is required when redistributing

Commercial License

For commercial use without AGPL obligations, commercial licenses are available. Contact licensing@penpage.com for inquiries.

Questions

If you have questions about our use of open-source software or licensing, please contact us at legal@penpage.com.

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