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# 3rd Party Licenses used in Qt

Run `configure -help` to see any options that may be available for controlling the use of these libraries.

- Freetype 2 (freetype)
- The Independent JPEG Group's JPEG software (libjpeg)
- Multiple-image Network Graphics (MNG) Reference Library (libmng)
- PNG reference library (libpng)
- Data compression library (zlib)
- Font files for Qt/Embedded

## Freetype 2 (freetype)

The FreeType project is a team of volunteers who develop free, portable and high-quality software solutions for digital typography. We specifically target embedded systems and focus on bringing small, efficient and ubiquitous products. -- quoted from `3rdparty/freetype/docs/freetype2.html`.

See `3rdparty/freetype/docs/FIL.txt` and `3rdparty/freetype/docs/GPL.txt` for license details.

See also the files in `3rdparty/opentype` which are used by Freetype.

## The Independent JPEG Group's JPEG software (libjpeg)

This package contains C software to implement JPEG image compression and decompression. JPEG (pronounced "jay-peg") is a standardized compression method for full-color and gray-scale images. JPEG is intended for compressing "real-world" scenes; line drawings, cartoons and other non-realistic images are not its strong suit. JPEG is lossy, meaning that the output image is not exactly identical to the input image. -- quoted from `3rdparty/libjpeg/README`.

See `3rdparty/libjpeg/README` for license details.

## Multiple-image Network Graphics (MNG) Reference Library (libmng)

The libmng library supports decoding, displaying, encoding, and various other manipulations of the Multiple-image Network Graphics (MNG) format image files. It uses the zlib compression library, and optionally the JPEG library by the Independent JPEG Group (IJG) and/or lcms (little cms), a color-management library by Marti Maria Saguer. -- quoted from `3rdparty/libmng/doc/libmng.txt`.

See `3rdparty/libmng/LICENSE` for license details.

## PNG reference library (libpng)

Libpng was written as a companion to the PNG specification, as a way of reducing the amount of time and effort it takes to support the PNG file format in application programs. -- quoted from `3rdparty/libpng/libpng.txt`.

See `3rdparty/libpng/LICENSE` for license details.

## Data compression library (zlib)

zlib is a general purpose data compression library. All the code is thread safe. The data format used by the zlib library is described by RFCs (Request for Comments) 1950 to 1952 -- quoted from `3rdparty/zlib/README`.

See `3rdparty/zlib/README` for license details.

## Font files for Qt/Embedded

The Helvetica BDF font files supplied with Qt/Embedded are distributed under the following highly permissive license. We recommend that all Qt/Embedded installations that use these font files also acknowledge this contribution, and quote this license statement in an appendix to the documentation. -- located in `lib/fonts`

Copyright 1984-1989, 1994 Adobe Systems Incorporated.

Copyright 1988, 1994 Digital Equipment Corporation.

Adobe is a trademark of Adobe Systems Incorporated which may be registered in certain jurisdictions. Permission to use these trademarks is hereby granted only in association with the images described in this file.

Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notices appear in all copies and that both those copyright notices and this permission notice appear in supporting documentation, and that the names of Adobe Systems and Digital Equipment Corporation not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. Adobe Systems and Digital Equipment Corporation make no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.