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See Map data license has been changed for more information.
On 1st October 2017, Terms of Use for Map Providing Service, Raster Data Providing Service and Rapid Survey Map of Kanto Plain/Tokyo 5000 MBTiles; for each "Credit for secondary use of data" will be changed.
You will have to show the credit.
For more information, see Terms of Use (Map Providing Service), Terms of Use (Raster Data Providing Service) or License / Rapid Survey Map of Kanto Plain/Tokyo 5000 MBTiles.