From the case:
Medusa (photo)
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Medusa By Carvaggio
Author: Michelangelo Merisi da Caravaggio or Caravaggio (1573(1573)–1610(1610))
Original file: http://commons.wikimedia.org/wiki/File:Medusa_by_Carvaggio.jpg
Modifications: background and drop shadow
License: This image (or other media file) is in the public domain because its copyright has expired. This applies to the United States, Australia, the European Union and those countries with a copyright term of life of the author plus 70 years.