The Qt Installer Framework sources include third party code:

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LZMA SDK

Parts of the sources from the LZMA SDK , version 9.20 are
under src/libs/7zip/unix and src/libs/7z/win.

The LZMA SDK is written and placed in the public domain by
Igor Pavlov. Some code in LZMA SDK is based on public domain
code from another developers:
1) PPMd var.H (2001): Dmitry Shkarin
2) SHA-256: Wei Dai (Crypto++ library)

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KD Tools

Sources for the KD Tools library are under src/libs/kdtools.

The library is released under the same license as the rest
of the installer framework (GPL 3.0/LGPL 2.1 with Digia
exception/Digia Commercial License).

The copyright is owned by Klaralvdalens Datakonsult AB.