Add links on upload filters

article/proceedings.tex

@@ -1267,6 +1267,21 @@ The planned introduction of upload filters by the EU copyright reform is seen cr
 via
 \url{https://de.wikipedia.org/wiki/Abschaltung_der_deutschsprachigen_Wikipedia_am_21._M%C3%A4rz_2019#/media/File:Blackout_of_wikipedia.de_by_Wikimedia_Deutschland_-_March_2019.png}
 
+see also
+\url{https://wikimediafoundation.org/2019/03/20/four-wikipedias-to-black-out-over-eu-copyright-directive/}
+"Volunteer editor communities in four language Wikipedias—German, Czech, Danish, and Slovak—have decided to black out the sites on 21 March in opposition to the current version of the proposed EU Copyright Directive.
+
+Those language editions of Wikipedia will redirect all visitors to a banner about the directive, blocking access to content on Wikipedia for 24 hours. "
+"These independent language communities decided to black out in the same way most decisions are made on Wikipedia—through discussion and consensus, "
+
+and
+\url{https://wikimediafoundation.org/2019/02/28/we-do-not-support-the-eu-copyright-directive-in-its-current-form-heres-why-you-shouldnt-either/}
+
+timeline
+\url{https://edri.org/upload-filters-status-of-the-copyright-discussions-and-next-steps/}
+
+\url{https://en.wikipedia.org/wiki/Directive_on_Copyright_in_the_Digital_Single_Market#Positions}
+
 \subsection{Directions for further studies}
 <insert long list of interesting questions here>