The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
§ 5. Results of intellectual activities to which this Act does not apply
1) ideas, images, notions, theories, processes, systems, methods, concepts, principles, discoveries, inventions, and other results of intellectual activities which are described, explained or expressed in any other manner in a work;
2) works of folklore;
3) legislation and administrative documents (acts, decrees, regulations, statutes, instructions, directives) and official translations thereof;
4) court decisions and official translations thereof;
5) official symbols of the state and insignia of organisations (flags, coats of arms, orders, medals, badges, etc.);
6) news of the day;
7) facts and data;
8) ideas and principles which underlie any element of a computer program, including those which underlie its user interfaces.
Hence it is assumed that this image has been released into the public domain. However, in some instances the use of this image might be regulated by other laws.