English: This image shows the signature of Sergey Vasilyevich Kravkov. Sergey Vasilyevich Kravkov was a Russian psychologist and psychophysiologist, Doctor of Science in Biology, Corresponding Member of the Academy of Science of the USSR and the Academy of Medical Science of the USSR.
This signature is believed to be ineligible for copyright and therefore in the public domain because it falls below the required level of originality for copyright protection both in the United States and in the source country (if different). In this case, the source country (e.g. the country of nationality of the signatory) is believed to be Russia.
Note that this tag cannot be used on all signatures, as not all signatures are copyright-free.