Open source PDF editor.
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README.txt

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==========================================================================
                    PDFforQt library / PDF viewer
                     (c) Jakub Melka 2018-2019
==========================================================================

This software is consisting of PDF rendering library, and viewer,
which can display PDF documents. Software is implementing the PDF
functionality based on PDF Reference 1.7. It is written and maintained
by Jakub Melka.

1. ACKNOWLEDGEMENTS

This software is based in part on the work of the Independent JPEG Group.

Portions of this software are copyright © 2019 The FreeType
Project (www.freetype.org). All rights reserved.

2. LEGAL ISSUES

Both library and viewer uses more benevolent LGPL license, so it is more
usable in commercial software, than GPL code only. Please see attached
file - LICENSE.txt to see details. This software also uses several
third party software, and user of this software must also respect licenses
of third party libraries.

3. THIRD PARTY LIBRARIES

    a) libjpeg, see https://www.ijg.org/, version 9c.
    b) FreeType, see https://www.freetype.org/index.html, FTL license used
    c) OpenJPEG, implementing Jpeg2000, see https://www.openjpeg.org/, 2-clause MIT license
    d) Qt, https://www.qt.io/, LGPL license used
    e) OpenSSL, https://www.openssl.org/, Apache 2.0 license