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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)

## 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.