It does appear that these copyright clauses exist to protect the local jurisdiction from any liability regarding (mis-)use of the data. Back in my paleo-GIS days, we were always concerned that someone would mis-construe the data and hold the County liable and were careful to put a disclaimer on all maps and digital products. But I think in most jurisdictions a lot of those concerns have gone by the wayside, just like the expectation of generating revenue from the data, as Elliott mentions.
Cheers, SEJ
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