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LICENSING.md

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# Licensing

Dagu source code is distributed under the GNU General Public License version 3 or later (`GPL-3.0-or-later`). See [LICENSE](./LICENSE).

This document does not relicense any source file. Files that currently carry `SPDX-License-Identifier: GPL-3.0-or-later` remain GPL-licensed unless a separate written agreement says otherwise.

## Embedded Go API

The Go package `github.com/dagucloud/dagu/v2` exposes an experimental embedded API. Applications that import or link this package and distribute the resulting binary should evaluate GPL obligations for the combined work.

For proprietary products that need to distribute Dagu as part of a non-GPL application, contact `company@descarty.com` to discuss a separate commercial embedding license.

Commercial embedding rights are not granted by this repository, this document, or the public GPL license. They require a separate written agreement with the copyright holder or authorized licensor.

## Current Public License

Under the public GPL license, users may use, modify, and distribute Dagu under the GPL terms. The GPL permits commercial activity, including selling copies or services, but distribution must comply with GPL obligations.

Using the Dagu CLI or server as a separate program is different from importing the embedded Go API into another distributed binary. Projects embedding Dagu should review their distribution model and license obligations.

## Dependencies

Third-party libraries linked into Dagu binaries must be available under a license compatible with `GPL-3.0-or-later` that also permits the separate embedding license above: permissive licenses such as BSD, MIT, or Apache-2.0, or file-level copyleft licenses such as MPL-2.0, which some existing dependencies use. Strong copyleft dependencies (GPL, LGPL, AGPL) are not accepted. The spreadsheet engine `github.com/xuri/excelize/v2` (BSD-3-Clause) follows this rule, as do the PDF reader `github.com/klippa-app/go-pdfium` (MIT), which carries PDFium (BSD-3-Clause) as WebAssembly, and the WebAssembly runtime `github.com/tetratelabs/wazero` (Apache-2.0).