+```apache
+<Directory /path/to/shaarli>
+ # Required for playvideos plugin
+ Header set Content-Security-Policy "script-src 'self' 'unsafe-inline' https://www.youtube.com https://s.ytimg.com 'unsafe-eval'"
+</Directory>
+```
+
+You may place the `Header` directive in the `<Directory...` section of your [webserver configuration](../../doc/md/Server-configuration.md)/virtualhost file, or write the above snippet to `/etc/apache2/conf-available/shaarli-csp.conf`; then run `a2enconf shaarli-csp; service apache2 reload`.