License!

The polygons generated by this site do not have any added restrictions beyond the base data from tiger and flickr.

By submitting votes to this site you are agreeing that your votes will be public and in the public domain.

The basic source data is from US TIGER/Line Census Data which is public domain (Q10). This site also makes use of data scraped from the flickr api -- you should probably mention on your site if you reuse this data that there is flickr data associated with it.