Removing clipboard.swf

Since clipboard.swf is not useful I suggest to remove following code from syntaxhighlighter.php (line 661):

echo " SyntaxHighlighter.config.clipboardSwf = '" . esc_js( apply_filters( 'syntaxhighlighter_clipboardurl', plugins_url( 'syntaxhighlighter2/scripts/clipboard.swf', __FILE__ ) ) ) . "';\n";

https://wordpress.org/plugins/syntaxhighlighter/