The maps distributed here[0], according to [1], were produced by the US government. IIRC, everything produced by the US government is released to the public domain, and I suppose this regulation applies to the aforementioned maps.

[0] ftp://geodetic.ncdenr.org/maps/
[1] http://www.ncgs.state.nc.us/dwgnote.html
--
Rodrigo Rodrigues da Silva
GNU LibreDWG maintainer
FSF Associate Member #7788
PoliGNU - Grupo de Estudos de Software Livre da Poli/USP

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