nigig-org/THIRD_PARTY_NOTICES.md

Third-Party Licenses

dart-pdf

Repository: https://github.com/DavBfr/dart_pdf
License: Apache License 2.0
Copyright: Copyright 2018-2025 DavBfr and the dart-pdf contributors

Architecture Attribution

The Nigig PDF crate architecture — four-layer crate separation (pdf-cos → pdf-document → pdf-graphics → pdf-makepad), the PdfDevice trait pattern, the content-stream interpreter pipeline, and the golden-test methodology at the engine-neutral boundary — was derived from the dart-pdf package architecture (commit 17df3d01, release 3.1.1).

Key Architectural Patterns Inherited from dart-pdf

1. Crate/Package Boundaries — dart-pdf's four packages (pdf, pdf_document, pdf_graphics, printing) directly informed the four-crate Rust structure.
2. PdfDevice Interface — The device/callback pattern for content stream interpretation (dart-pdf's PdfDevice class) became the PdfDevice trait in pdf-graphics.
3. Font Engine Design — dart-pdf's Font class and CID font handling architecture informed the GlyphWidths, CMap, and SFNT parsing modules.
4. Content Stream Parser — The single-pass operator parsing approach was adapted from dart-pdf's ContentStream parser.
5. Test Structure — dart-pdf's three testing layers (unit tests, corpus tests, golden tests) were replicated.

Modified from Original

The following adaptations were made from dart-pdf's implementation:

• Language: Ported from Dart to Rust, using Rust idioms (ownership, traits, pattern matching)
• Compression: Uses miniz_oxide crate instead of Dart's zlib
• Incremental Updates: Extended from dart-pdf's update package
• Encryption: Implemented with rc4, aes, and md-5 crates; adapted from dart-pdf's crypto implementations
• Rendering: PDF → makepad DrawVector/DrawText instead of Flutter canvas

dart-pdf License Text

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
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   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      For easy redistribution by licensees of an
      Apache-licensed product, the accompanying
      NOTICE file may be replaced with this notice:

         Copyright 2018-2025 DavBfr

      Licensed under the Apache License, Version 2.0 (the "License");
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      You may obtain a copy of the License at

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makepad

Repository: https://github.com/andodeki/makepad
License: MIT OR Apache-2.0 (dual-licensed)
Copyright: Copyright 2024 Makepad authors

The pdf-makepad crate depends on the Makepad framework (makepad-widgets) for rendering PDF content to GPU draw lists. Makepad is dual-licensed under MIT and Apache-2.0.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

miniz_oxide

Repository: https://github.com/bytecode-crypt/miniz_oxide
License: MIT OR Zlib
Copyright: Copyright (c) 2018 The Chromium Authors and miniz_oxide contributors

Used by nigig-pdf-cos for FlateDecode decompression and zlib compression of PDF objects.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Crypto Dependencies (encryption)

The following crates are used by nigig-pdf-cos for PDF encryption:

• rc4 (rc4 crate) — MIT OR BSD-3-Clause
• aes (aes crate) — MIT OR Apache-2.0
• md-5 (md-5 crate) — MIT OR Apache-2.0
• sha2 (sha2 crate) — MIT OR Apache-2.0
• block-modes (block-modes crate) — MIT OR Apache-2.0
• cbc (cbc crate) — MIT OR Apache-2.0
• cipher (cipher crate) — MIT OR Apache-2.0
• crypto-common (crypto-common crate) — MIT OR Apache-2.0
• block-padding (block-padding crate) — MIT OR Apache-2.0
• block-buffer (block-buffer crate) — MIT OR Apache-2.0
• inout (inout crate) — MIT OR Apache-2.0
• digest (digest crate) — MIT OR Apache-2.0