Adding upstream version 2:20.4+dfsg.upstream/2%20.4+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Goals and features
+
+**libdvdread** is a library for simple navigation of DVD (DVDs without menus).
+
+Written in C, cross-platform, it gives low-level access to DVD structures.
+
+It works well in conjunction with ***libdvdnav*** *(menus)* and ***libdvdcss*** *(cipher)*.
+
+## Where does it come from?
+
+This library is based on a lot of code and expertise from the **Ogle project**.
+**Ogle** was the first DVD player who implemented **free DVD navigation**. The
+**libdvdread** developers wish to express their gratitude to the Ogle people
+for all the valuable research work they have done.
+
+Initially, the dvdnav code was part of a plugin to the xine media player
+called xine-dvdnav. Later on, the DVD VM specific code was split
+from xine-dvdnav and went into the first version of libdvdnav.
+
+Then, it was forked, and forked again on MPlayer repositories.
+libdvdnav and libdvdread were merged, and then split again.
+
+## Where is it now?
+
+Libdvdread is hosted [here](https://code.videolan.org/videolan/libdvdread).
+
+Libdvdnav is hosted [here](https://code.videolan.org/videolan/libdvdnav).
+
+You can find more information [here](https://www.videolan.org/developers/libdvdnav.html)
+
+Please report bugs to the developers mailinglist at
+[dvdnav mailing list](https://mailman.videolan.org/listinfo/libdvdnav-devel)
+
+## License
+
+**Libdvdread** is completely licensed under GPLv2/v3. You may use it at wish within the
+bounds of this license. See the file [COPYING](https://code.videolan.org/videolan/libdvdread/-/blob/master/COPYING) for a copy of the GPL.
+
+## Using libdvdread
+
+A detailed description of DVD structures is available [here](http://www.mpucoder.com/dvd/)
+
+All documentation is also accessible [here](http://dvdnav.mplayerhq.hu/#docs)
+
+## Deciphering disks
+
+**Libdvdread** does not do any decryption of the CSS algorithm. This task can be delegated to **libdvdcss**.
+
+Install *libdvdcss* from source or from your distribution (*libdvd-pkg*) to play full DVDs,
+if your country allows this to work legally.
+
+Note that *libdvdnav* is useful for interactive DVD menus.
+
+## CoC
+
+The [VideoLAN Code of Conduct](https://wiki.videolan.org/Code_of_Conduct/) applies to this project.