This file has been released into the public domain by the copyright holder, its copyright has expired, or it is ineligible for copyright. This applies worldwide.
Note: This tag is obsolete! Don't use this generic template - please use instead:
{{PD-old}} (for works out of copyright where the author has been dead for over 70 years),
{{PD-Art}} (for photos of old paintings and art out of copyright),
The picture is from [1]. The "Copyright information" at the bottom of the page says: "We believe that most of the images are in the public domain" which is good enough for me.