Many thanks to the authors of the 3rd party code used in Ticket Wizard. Here is the list in the alphabetical order.
FreeType is a freely available software library to render fonts. Licensed under the BSD-like FreeType license https://www.freetype.org/index.html
Copyright (c) 2010, 2011 Marti Maria Saguer. All rights reserved. Little CMS engine is provided free of charge under MIT LICENSE http://www.littlecms.com/
Copyright (c) 2017 PDFium Authors. All rights reserved. Use of this source code is governed by a BSD-style license. https://pdfium.goog
The Qt GUI Toolkit is Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). Contact: Nokia Corporation (email@example.com) Qt is available under the LGPL. http://qt-project.org/doc/qt-4.8/lgpl.html
Released to the public for free under the terms of the MIT License https://github.com/tfussell/xlnt