pdflinkcheck
Copyright 2025 George Clayton Bennett

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Core Software License
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The source code of pdflinkcheck itself is permissively licensed under 
the MIT License (see the accompanying LICENSE file).

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Optional Third-Party Dependencies & Binary Distributions
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pdflinkcheck supports multiple underlying PDF parsing engines. Depending 
on how you install, invoke, or distribute the software, different third-party 
license obligations may apply:

1. Pure Python & PDFium Backends (MIT/BSD):
   By default, installations utilizing the `pypdf` engine or the `pdfium` 
   engine (via pypdfium2) contain exclusively permissive open-source 
   dependencies (MIT and BSD-3-Clause). 

2. PyMuPDF Backend (AGPL v3.0 or later):
   Integration with PyMuPDF (fitz) is completely optional. PyMuPDF is 
   licensed under the GNU Affero General Public License (AGPL v3.0 or later).
   
   - If you install pdflinkcheck with the optional PyMuPDF extra, or 
     distribute binaries/pre-compiled executables that explicitly incorporate 
     PyMuPDF, those specific distributed artifacts become subject to the 
     terms of the AGPL v3.0.
   - For AGPL-licensed binary distributions, the corresponding source code 
     is continuously preserved and made available via the project's 
     GitHub Releases page.

Please inspect the respective licensing terms of any optional engine 
dependencies you explicitly enable:
- PyMuPDF (AGPLv3): https://github.com/pymupdf/PyMuPDF
- pypdf (MIT): https://github.com/py-pdf/pypdf
- pypdfium2/PDFium (MIT/Apache-2.0): https://github.com/pypdfium2-team/pypdfium2
