Copyright
The Google Maps terms and conditions state that usage of material from Google Maps is regulated by Google Terms of Service and some additional restrictions. Google has either purchased local map data from established companies, or has entered into lease agreements to use copyrighted map data. The owner of the copyright is listed at the bottom of zoomed maps. For example street maps in Japan are leased from Zenrin. Street maps in China are leased from Mapabc. Russian street maps are leased from Geocentre Consulting and Tele Atlas. Data is unavailable for North Korea, so the country is blank, though the companion project Google Map Maker shows some information.
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