[Pkg-kde-extras] About "+dfsg" of qtbase-opensource-src

[GONG Ruiqi]

Dear Debian Qt Maintainers,

Recently I've been researching the open-source license compliance
situation of multiple communities, and I'm impressed by the DFSG
practice of Debian community, which makes me want to dive into it to see
more details.

And then I came across the Qt source package. By comparing with the
upstream release[1], I noticed that qtbase-opensource-src[2]
(specifically, 5.15.15+dfsg-6), besides some binaries and rfcxxx docs,
removed the following components:

  examples/xml/htmlinfo/
  src/3rdparty/iaccessible2/
  src/3rdparty/sqlite/
  src/3rdparty/wintab/

But I don't see how/why these particular components violates the DSFG,
as they seem to be well licensed and allow others to
use/redistribute/modify them. So would you please explain the reason for
their removal? Thanks in advance.

Best regards,
Ruiqi Gong

[1]: https://code.qt.io/cgit/qt/qtbase.git/tag/?h=v5.15.15-lts-lgpl
[2]: https://packages.debian.org/source/stable/qtbase-opensource-src