Wikipedia is a freely editable web-based encyclopedia accessible to anyone. It contains some 180,000 articles in Hungarian.
Editors of the Hungarian Wikipedia discovered in September 2010 that
This serious violation was eventually revealed by the editors of Wikipedia themselves, and addressing the issue has been a top priority. All the articles of the editor in question have been checked for plagiarism in a massive effort spanning several weeks and involving about a dozen editors. In the end, 5,227 articles had to be deleted, while another 424 were re-written to rectify the copyright infringements. The impacted publishers have been notified as well.