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   <p>For instructions on how to install FFmpeg on Mac, Linux, and Windows, refer to Reto Kromer’s <a href="https://avpres.net/FFmpeg/#ch1" target="_blank">installation instructions</a>.</p>
   <p>For Bash and command line basics, try the <a href="https://learnpythonthehardway.org/book/appendixa.html" target="_blank">Command Line Crash Course</a>. For a little more context presented in an ffmprovisr style, try <a href="http://explainshell.com/" target="_blank">explainshell.com</a>!</p>
   <h5>License</h5>
-  <p><a href="https://creativecommons.org/licenses/by-sa/4.0/" target="_blank"><img alt="Creative Commons License" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png"></a><br>
-    This work is licensed under a <a href="https://creativecommons.org/licenses/by-sa/4.0/" target="_blank">Creative Commons Attribution-ShareAlike 4.0 International License</a>.</p>
+  <p><a href="https://creativecommons.org/licenses/by/4.0/" target="_blank"><img alt="Creative Commons License" src="https://i.creativecommons.org/l/by/4.0/88x31.png"></a><br>
+    This work is licensed under a <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">Creative Commons Attribution 4.0 International License</a>.</p>
   <h5>Sister projects</h5>
   <p><a href="http://dd388.github.io/crals/" target="_blank">Script Ahoy</a>: Community Resource for Archivists and Librarians Scripting</p>
   <p><a href="https://datapraxis.github.io/sourcecaster/" target="_blank">The Sourcecaster</a>: an app that helps you use the command line to work through common challenges that come up when working with digital primary sources.</p>