These are the (about) weekly planet dumps, based on the OpenStreetMap.org database.
They are distributed under a Creative Commons Attribution-ShareAlike 2.0 license.

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We also provide minutely, hourly and daily diff files. These have been produced with osmosis
(http://wiki.openstreetmap.org/wiki/Osmosis)

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If you find data within OpenStreetMap that you believe is an infringement of 
someone else's copyright, then please make contact with the OpenStreetMap 
Data Working Group. (http://wiki.openstreetmap.org/wiki/Data_working_group)