These files are derived from Dave's Redistricting's vtd_data, licensed
CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/) with the
condition that the data is never sold, and are released under the same
license: CC BY-SA 4.0, attribution "Call the Map; Dave's Redistricting; Voting
and Election Science Team", not to be sold under any circumstances.
