Whats means "source;prow_ref=norfolk_county_council_prow_gis_data" ?

whats means "source;maxspeed=survey" ?

whats means "source;maxspeed=Bing;Mapillary" ?

Of Course this is ATM. In future i'll make more correctly made changes. I was tried find & remove uncorrect tags using service: http://taginfo.openstreetmap.org.
I am don't understand what someone else looking for me. Thankyou for lecture.