I have always found copyright of maps and map data to be unclear. Holders of copyrighted maps / map data have often taken an approach that differs with what a great number of map/data users would like to see. For instance, the New York Metropolitan Transit Authority and BART in the San Fransisco Bay area are seeking to enforce what they perceive as their copy-rights on the issue of iPOD maps. Users, on the other hand, continually push for greater and freer access to data and maps, wanting fewer copyright impediments. Interestingly, these arguments seem to focus only on government-produced data.