Open-source software
Third-party licenses
Some of the code that runs in your browser when you use XOsign comes from open-source projects. This page names it, links to its license, and says where to get its source code.
The components below reach your browser under the GNU Lesser General Public License (LGPL). That license asks us to tell you they are there, to link to its full text, and to show you where to get their source code.
heic-to
Turns an iPhone photo (HEIC or HEIF) into a JPEG in your browser when you add one to a document.
- Version we use
- 1.5.2
- License
- GNU Lesser General Public License v3.0 (LGPL-3.0)
- Source code
- github.com/hoppergee/heic-to/tree/v1.5.2
- Copyright and authors
- Hopper Gee
Built into heic-to
heic-to contains these two libraries, compiled to run in a browser. Each one has its own license and source code.
libheif
Reads HEIC and HEIF image files.
- Version we use
- 1.22.2
- License
- GNU Lesser General Public License v3.0 (LGPL-3.0)
- Source code
- github.com/strukturag/libheif/tree/v1.22.2
- Copyright and authors
- Copyright (c) 2017-2020 Struktur AGCopyright (c) 2017-2026 Dirk Farin
libde265
Decodes the HEVC (H.265) picture stored inside an iPhone photo.
- Version we use
- 1.0.16
- License
- GNU Lesser General Public License v3.0 (LGPL-3.0)
- Source code
- github.com/strukturag/libde265/tree/v1.0.16
- Copyright and authors
- Copyright (c) 2013-2014 Struktur AGCopyright (c) 2013-2024 Dirk Farin
How we use it, and your rights
We use heic-to exactly as its authors publish it. We have not changed its code, or the code of the libraries inside it.
It is not built into XOsign's own code. Your browser downloads it as a separate file, only when you add an iPhone photo.
The LGPL lets you study, change and share this library, use a changed version of it in place of ours, and get its complete source code from the links above.
These rights come from the LGPL itself. Nothing in XOsign's Terms of Service or Acceptable Use Policy limits them, not even the rule against reverse-engineering.
Full license texts
The LGPL is written as extra permissions on top of the GNU General Public License (GPL), so both texts apply.
Questions about this page? Write to support@xosign.ai.