At the bottom of
http://www.donland.ru/ it states: Все материалы сайта доступны по лицензии: Creative Commons Attribution 4.0 International
Licensing
This file comes from the website of the Government of
Rostov Oblast and is copyrighted. This file is licenced under the
Creative CommonsAttribution 4.0 Licence. In short: you are free to distribute and modify the file as long as you attribute Donland.ru (if copying information onto an Internet site this must be an interactive link). The license permission is shown on the
main page.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue