IPod Maps Draw Legal Threats

This is twisted. Several sites offer free transit map downloads of images that will work on iPod, and the transit agencies threaten to sue them. I think it is fine for MTA or BART to sell umbrellas and sox and other items with their logos, but if they can't or don't produce the actual maps for download it is stupid to tell others they can't. None of the download places were charging for the maps. Aren't these public service agencies? They should be more open source, and the public could help them and would help them solve some of their problems with creativity.Wired News: IPod Maps Draw Legal Threats