Update customer visible copyright to 2026

LICENSE.txt

@@ -1,5 +1,5 @@
 MuseScore Studio, free and open source music notation software
-Copyright (C) 1999-2025 MuseScore Limited and others
+Copyright (C) 1999-2026 MuseScore Limited and others
 
 This program is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License version 3 as published

buildscripts/packaging/Windows/Installer/LICENSE.rtf

@@ -1,7 +1,7 @@
 {\rtf1\ansi\ansicpg1252\deff0\nouicompat{\fonttbl{\f0\fnil\fcharset0 Courier New;}{\f1\fnil\fcharset77 Courier New;}}
 {\*\generator Riched20 6.3.9600}\viewkind4\uc1 
 \pard\sa200\sl276\slmult1\f0\fs18\lang12 MuseScore Studio, free and open source music notation software.\par
-Copyright (C) 1999-2025 MuseScore Limited and others.\par
+Copyright (C) 1999-2026 MuseScore Limited and others.\par
 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 3 as published by the Free Software Foundation and reproduce below with the following exception:\par
 - If you create a document which uses fonts included in MuseScore Studio, and embed this font or unaltered portions of this font into the document, then this font does not by itself cause the resulting document to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the document might be covered by the GNU General Public License. If you modify this font, you may extend this exception to your version of the font, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.\par
 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.\par

src/app/CMakeLists.txt

@@ -69,7 +69,7 @@ elseif(OS_IS_MAC)
     set(MACOSX_BUNDLE_LONG_VERSION_STRING ${MUSE_APP_VERSION})
     set(MACOSX_BUNDLE_SHORT_VERSION_STRING ${MUSE_APP_VERSION})
     set(MACOSX_BUNDLE_BUNDLE_VERSION ${CMAKE_BUILD_NUMBER})
-    set(MACOSX_BUNDLE_COPYRIGHT "Copyright © 1999-2025 MuseScore Limited. Published under the GNU General Public License version 3.")
+    set(MACOSX_BUNDLE_COPYRIGHT "Copyright © 1999-2026 MuseScore Limited. Published under the GNU General Public License version 3.")
 
     set(CMAKE_INSTALL_RPATH ${QT_INSTALL_LIBS})
     if (MUE_COMPILE_MACOS_PRECOMPILED_DEPS_PATH)

src/appshell/qml/MuseScore/AppShell/AboutDialog.qml

@@ -138,7 +138,7 @@ StyledDialogView {
 
             StyledTextLabel {
                 Layout.fillWidth: true
-                text: qsTrc("appshell/about", "Copyright © 1999-2025 MuseScore Limited.\nPublished under the <a href=\"%1\">GNU General Public License version 3</a>.")
+                text: qsTrc("appshell/about", "Copyright © 1999-2026 MuseScore Limited.\nPublished under the <a href=\"%1\">GNU General Public License version 3</a>.")
                       .arg("https://www.gnu.org/licenses/gpl-3.0.html")
                       .replace("\n", "<br>")