A question for #OpenStreetMap mappers. There is a mall in my city, which I'm using a lot and it was not mapped properly, since 2019 I think — there are a lot of non-existent amenities, a lot of new amenities don't exist on the map, and a lot of POI placed semi-randomly.
I tried to fix it "on foot" by editing and moving amenities, but it is not very easy for me with Every Door application and without JOSM (and without the big screen with a big keyboard) 
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So, I think about to take the official website of the mall, which has the actual information about all the stores inside and about their position inside the building — and fix the #OSM map for this mall.
But I unable to find — is it legal (in terms of OSM) to use this external source of information (floor plans for mall visitors) in OSM mapping?