----------------------------Original message---------------------------- I'm not a lawyer, but my understanding of the unclassified data produced by the Federal Government of the United States (TIGER and STF3a Census data, and Digital Chart of the World, for example) is that it is public domain--there is no copyright. This is not the case with other governments; for example, the British government maintains a copyright on the map data generated by the Ordinance Survey. Data obtained from other, non-Federal sources, like the Landsat program, are copywritten by the provider and this data is generally only made available to a restricted audience as part of the sales agreement, anyway. Alan Brenner, U. S. Environmental Protection Agency My opinions, etc....