update copyright and normalize licensing

Author: jimustafa

cheatsheets.tex

@@ -1038,7 +1038,8 @@
   \end{myboxed}
   %
   \begin{center}
-  \href{https://github.com/matplotlib/cheatsheets}{Matplotlib Cheatsheets} (c) 2020 Nicolas P. Rougier\\
+  \href{https://github.com/matplotlib/cheatsheets}{Matplotlib Cheatsheets}\\
+  Copyright (c) 2021 Matplotlib Development Team\\
   Released under a CC-BY 4.0 International License\\
   \smallskip
   \includegraphics[width=\columnwidth]{numfocus.png}

handout-beginner.tex

@@ -296,9 +296,12 @@ \subsection*{\rmfamily Save \mdseries (bitmap or vector format)}
 %
 \vfill
 %
-{\scriptsize Matplotlib 3.4.2 handout for beginners. Copyright (c)
-  2020 Nicolas P. Rougier. Released under a CC-BY International 4.0
-  License. Supported by NumFocus Grant \#12345.\par}
+{\scriptsize
+  Matplotlib 3.4.2 handout for beginners.
+  Copyright (c) 2021 Matplotlib Development Team.
+  Released under a CC-BY 4.0 International License.
+  Supported by NumFocus Grant \#12345.
+\par}
 
 \end{multicols*}
 \end{document}

handout-intermediate.tex

@@ -197,9 +197,12 @@ \subsection*{\rmfamily Size \& DPI}
 
 \vfill
 %
-{\scriptsize Matplotlib 3.4.2 handout for intermediate users. Copyright
-  (c) 2020 Nicolas P. Rougier. Released under a CC-BY 4.0
-  License. Supported by NumFocus Grant \#12345.\par}
+{\scriptsize
+  Matplotlib 3.4.2 handout for intermediate users.
+  Copyright (c) 2021 Matplotlib Development Team.
+  Released under a CC-BY 4.0 International License.
+  Supported by NumFocus Grant \#12345.
+\par}
 
 
 

handout-tips.tex

@@ -242,10 +242,12 @@ \subsection*{\rmfamily Read the documentation}
 
 \vfill
 %
-{\scriptsize Matplotlib 3.4.2 handout for tips \& tricks.
-             Copyright (c) 2020 Nicolas P. Rougier.
-             Released under a CC-BY 4.0 License.
-             Supported by NumFocus Grant \#12345.\par}
+{\scriptsize
+  Matplotlib 3.4.2 handout for tips \& tricks.
+  Copyright (c) 2021 Matplotlib Development Team.
+  Released under a CC-BY 4.0 International License.
+  Supported by NumFocus Grant \#12345.
+\par}