Open-source licences / 开源许可

This page identifies the principal open-source components distributed with the viewer. Individual files and components remain subject to their own licence terms. / 本页列出随查看器发布的主要开源组件；各文件及组件仍分别受其自身许可证约束。

Project repository / 项目仓库

CADViewer public repository on GitHub. The matching LibreDWG source, modification markers, build instructions and distributed-file checksums are recorded in CORRESPONDING_SOURCE.md.

Application code / 应用代码

The application is derived from mlightcad/cad-viewer and includes code under the MIT License. Because the distributed viewer directly integrates GPL-3.0-or-later LibreDWG components, the combined viewer distribution is offered under GPL-3.0-or-later. The original MIT terms remain available for independently used MIT-covered source files. Retained texts: MIT and GPL-3.0-or-later.

DWG parser / DWG 解析器

The bundled LibreDWG JavaScript and WebAssembly components are distributed under GPL-3.0-or-later. This release uses GNU LibreDWG 0.14.8556 and mlightcad/libredwg-web 0.7.9 with the modifications and build information published in the corresponding-source directory. See the GPL licence text, matching source snapshot, mlightcad/libredwg-web and GNU LibreDWG source.

3D import / 3D 导入

The STEP, IGES and BREP import path uses occt-import-js 0.0.23 under LGPL-2.1. It incorporates Open CASCADE Technology, which uses LGPL-2.1 with the Open CASCADE exception. Retained texts: occt-import-js licence, Open CASCADE licence and Open CASCADE exception.

Other bundled components / 其他组件

• The SHX parser notice is available in shx-parser-LICENSE.txt.
• The font engine bundle includes the SHX parser and supporting libraries such as iconv-lite, buffer, ieee754 and safe-buffer; their applicable notices must be retained when redistributing the bundle.
• The public viewer self-hosts the Basic, Tenor Sans and VT323 drawing-font data sets. Direct licence links: Basic OFL, Tenor Sans OFL and VT323 OFL; source URLs and checksums are in the font manifest. Other user-supplied font files remain governed by their own licences.