diff --git a/TravelingWaves/AuxiliaryFunctions.h b/TravelingWaves/AuxiliaryFunctions.h
index f773070..784809e 100644
--- a/TravelingWaves/AuxiliaryFunctions.h
+++ b/TravelingWaves/AuxiliaryFunctions.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef AUXILIARY_FUNCTIONS
 #define AUXILIARY_FUNCTIONS
 
diff --git a/TravelingWaves/IntegrateSystem.h b/TravelingWaves/IntegrateSystem.h
index ec71494..28002ea 100644
--- a/TravelingWaves/IntegrateSystem.h
+++ b/TravelingWaves/IntegrateSystem.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef INTEGRATE_SYSTEM
 #define INTEGRATE_SYSTEM
 
@@ -99,4 +109,4 @@ void IntegrateSystemAtTimePoints(
 
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/LimitSolution.cc b/TravelingWaves/LimitSolution.cc
index 039bba7..3ded098 100644
--- a/TravelingWaves/LimitSolution.cc
+++ b/TravelingWaves/LimitSolution.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "LimitSolution.h"
 
 namespace TravelingWave
@@ -72,4 +82,4 @@ namespace TravelingWave
     }
   }
 
-} // namespace TravelingWave
\ No newline at end of file
+} // namespace TravelingWave
diff --git a/TravelingWaves/LimitSolution.h b/TravelingWaves/LimitSolution.h
index e5dcc20..767b338 100644
--- a/TravelingWaves/LimitSolution.h
+++ b/TravelingWaves/LimitSolution.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef LIMIT_SOLUTION
 #define LIMIT_SOLUTION
 
@@ -44,4 +54,4 @@ namespace TravelingWave
 
 } // namespace TravelingWave
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/LinearInterpolator.h b/TravelingWaves/LinearInterpolator.h
index 7c2720d..f153c7c 100644
--- a/TravelingWaves/LinearInterpolator.h
+++ b/TravelingWaves/LinearInterpolator.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef LINEAR_INTERPOLATOR
 #define LINEAR_INTERPOLATOR
 
@@ -56,4 +66,4 @@ Number_Type LinearInterpolator<Number_Type>::value(const Number_Type x) const
   return res;
 }
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/Parameters.cc b/TravelingWaves/Parameters.cc
index 4222601..430fea5 100644
--- a/TravelingWaves/Parameters.cc
+++ b/TravelingWaves/Parameters.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "Parameters.h"
 
 namespace TravelingWave
diff --git a/TravelingWaves/Parameters.h b/TravelingWaves/Parameters.h
index 554a510..936ae88 100644
--- a/TravelingWaves/Parameters.h
+++ b/TravelingWaves/Parameters.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef PARAMETERS
 #define PARAMETERS
 
diff --git a/TravelingWaves/Solution.cc b/TravelingWaves/Solution.cc
index 962334b..42433bc 100644
--- a/TravelingWaves/Solution.cc
+++ b/TravelingWaves/Solution.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "Solution.h"
 
 namespace TravelingWave
@@ -87,4 +97,4 @@ namespace TravelingWave
 
   template class SolutionVectorFunction<Interpolant>;
 
-} // namespace TravelingWave
\ No newline at end of file
+} // namespace TravelingWave
diff --git a/TravelingWaves/Solution.h b/TravelingWaves/Solution.h
index 4bddad2..88bd22c 100644
--- a/TravelingWaves/Solution.h
+++ b/TravelingWaves/Solution.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef SOLUTION
 #define SOLUTION
 
@@ -64,4 +74,4 @@ namespace TravelingWave
 
 } // namespace TravelingWave
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/TravelingWaveSolver.cc b/TravelingWaves/TravelingWaveSolver.cc
index cb5fd1d..cb1edfd 100644
--- a/TravelingWaves/TravelingWaveSolver.cc
+++ b/TravelingWaves/TravelingWaveSolver.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "TravelingWaveSolver.h"
 
 namespace TravelingWave
diff --git a/TravelingWaves/TravelingWaveSolver.h b/TravelingWaves/TravelingWaveSolver.h
index 56b0187..e5f01e0 100644
--- a/TravelingWaves/TravelingWaveSolver.h
+++ b/TravelingWaves/TravelingWaveSolver.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef TRAVELING_WAVE_SOLVER
 #define TRAVELING_WAVE_SOLVER
 
@@ -112,4 +122,4 @@ namespace TravelingWave
 
 } // namespace TravelingWave
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/calculate_profile.cc b/TravelingWaves/calculate_profile.cc
index 21be543..212228e 100644
--- a/TravelingWaves/calculate_profile.cc
+++ b/TravelingWaves/calculate_profile.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "TravelingWaveSolver.h"
 #include "calculate_profile.h"
 
@@ -273,4 +283,4 @@ namespace TravelingWave
 
   }
 
-} // namespace TravelingWave
\ No newline at end of file
+} // namespace TravelingWave
diff --git a/TravelingWaves/calculate_profile.h b/TravelingWaves/calculate_profile.h
index 8194f99..17a9750 100644
--- a/TravelingWaves/calculate_profile.h
+++ b/TravelingWaves/calculate_profile.h
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #ifndef CALCULATE_PROFILE
 #define CALCULATE_PROFILE
 
@@ -27,4 +37,4 @@ namespace TravelingWave
 
 } // namespace TravelingWave
 
-#endif
\ No newline at end of file
+#endif
diff --git a/TravelingWaves/main.cc b/TravelingWaves/main.cc
index 59431a7..ce791f2 100644
--- a/TravelingWaves/main.cc
+++ b/TravelingWaves/main.cc
@@ -1,3 +1,13 @@
+/* -----------------------------------------------------------------------------
+ *
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+ * Copyright (C) 2024 by Shamil Magomedov
+ *
+ * This file is part of the deal.II code gallery.
+ *
+ * -----------------------------------------------------------------------------
+ */
+
 #include "calculate_profile.h"
 
 int main(int argc, char *argv[])
diff --git a/TravelingWaves/plot.py b/TravelingWaves/plot.py
index 6c80f62..d1abdb7 100644
--- a/TravelingWaves/plot.py
+++ b/TravelingWaves/plot.py
@@ -1,3 +1,13 @@
+## -----------------------------------------------------------------------------
+##
+## SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception OR LGPL-2.1-or-later
+## Copyright (C) 2024 by Shamil Magomedov
+##
+## This file is part of the deal.II code gallery.
+##
+## -----------------------------------------------------------------------------
+##
+
 import numpy as np
 import matplotlib.pyplot as plt
 import os