Files for your version.

Choosing your files

The source ZIP includes the library sources, patches and build instructions. The complete notices ZIP includes licence texts and library-rights information; extract it to follow references in the separate notice index.

The release mapping identifies the exact submission package for each version and checksums. The source kit includes instructions for replacing compatible playback libraries in the Store package, Cosmisan.CosmiPlayer.

Playback-library replacement instructions

These instructions accompany version 1.1.0.0. For earlier versions, also consult the instructions in the matching source kit.

Cosmi Player - playback library source and replacement instructions

What these materials cover
--------------------------
Cosmi Player uses LibVLCSharp and LibVLCSharp.WPF 3.10.1, a custom LibVLC
3.0.23 native build, FFmpeg 4.4.5, LIVE555 2026.08.25 and other libraries.
The covered libraries retain their own licences. Cosmi Player's application
source is separate and is not part of the library source kit.

Source materials for Cosmi Player 1.1.0.0
---------------------------------------
Matching native library sources, patches, dependency recipes and build
instructions are retained in the native source-build archive. The wrapper
source is pinned to commit 4896d0e06d19ac40b46802cf7dc167d432f3fd63 in
VideoLAN's LibVLCSharp repository, covering both managed assemblies.
The combined library source kit is distributed separately from the app:
https://cosmisan.com/apps/cosmi-player/downloads/
Select the source kit and checksums matching your application version.
Support: support@cosmisan.com.

The supplied source kit contains the original library sources, modifications,
build instructions and component provenance. A link to an upstream project's
current homepage alone is not a substitute for this matching source material.
Library sources can be modified and redistributed under their own licences;
the paid application does not need to be given away to exercise those rights.

Preparing a compatible replacement
----------------------------------
1. Obtain the source kit matching the installed release and read its build
   instructions and component licences. Modify and compile the library you
   want to change. A source ZIP is not itself a loadable playback library.
2. Start with a copy of the app's complete bundled libvlc folder, in a writable
   folder on a local drive outside WindowsApps. The installed app location can
   be found with this read-only PowerShell command for the Store release:
       (Get-AppxPackage -Name Cosmisan.CosmiPlayer).InstallLocation
   Copy the libvlc subfolder; do not alter WindowsApps.
3. Replace the compiled component and any matching dependencies in your copy.
   Keep compatible Windows x64 native libraries, LibVLC 3 APIs and managed
   wrapper APIs. The set's root must contain:
       managed/LibVLCSharp.dll
       managed/LibVLCSharp.WPF.dll
       win-x64/libvlc.dll
       win-x64/libvlccore.dll
       win-x64/<supporting native libraries>
       win-x64/plugins/<plugin folders and DLLs>
   For LIVE555 changes, rebuild the VLC RTSP plugin containing that code using
   the native source kit; merely adding a separate LIVE555 DLL does not replace
   the code incorporated into that plugin.
4. In Settings, under Playback libraries, choose that set's root folder, then
   Save and restart. Existing recording confirmation still applies. Playback
   libraries cannot be exchanged inside a running player. The chooser checks
   compatibility and runs selected code during its check; use code you trust.
5. To restore the supplied set, choose Use bundled libraries, then Save and
   restart. If a custom set cannot start, use the recovery screen's bundled
   option. The app also accepts --restore-bundled-libraries at startup.

The application does not require replacement libraries to have our original
hashes or signing key. Both managed wrappers and the native set are replaceable;
compatible replacements do not require modifying or re-signing the app package.
Windows security or organisation policy can independently block a DLL. These
instructions do not ask you to disable Windows protection or bypass such policy.

The Library rights document preserves the applicable modification and debugging
permissions. Original component licence texts are included in the app's
Legal Information viewer and the complete notices archive.

Covered-library rights

Cosmi Player - third-party library rights

For copies acquired through Microsoft Store, the Standard Application License
Terms applicable to that acquisition govern Cosmi Player, subject to the
third-party library exceptions in this notice.

Third-party components retain their own licences. Their applicable licences
govern your rights to those components and take precedence over conflicting
application terms. No application term limits rights granted by those licences
to use, copy, modify or redistribute the covered components.

Certain Microsoft runtime files use the Microsoft .NET Library License or
Windows SDK terms identified in Licenses/Microsoft/SCOPE.txt. Those applicable
terms govern those files; use them as part of Cosmi Player, and obtain the
applicable licence rights for any separate use or redistribution. Preserve
Microsoft and supplier notices. These component-specific terms do not restrict
the LGPL permissions for the separate covered playback libraries below.

Cosmi Player uses libraries covered by the GNU Lesser General Public License
(LGPL), including LibVLCSharp, LibVLCSharp.WPF and covered native playback
libraries and plugins. LIVE555 library code is included in the RTSP plugin.

To the extent required by the applicable LGPL, you may modify the combined
work for your own use, including replacing or relinking covered libraries with
compatible modified versions, and reverse engineer the work to debug those
modifications. Application restrictions on modification, reverse engineering
or working around technical limitations do not restrict these permissions.

Cosmi Player remains a separately licensed commercial application. This notice
does not relicense its proprietary application code under the LGPL. The
third-party components' licences, notices and applicable source and installation
information remain part of the library compliance materials for each release.

This notice preserves library rights; it is not a substitute for the complete
third-party licences, corresponding source or replacement instructions.