The ability to legally modify any part of the database (including any particular tag) is pretty clear in the ODbL (and the definition of open data). I don't know if it's explicitly stated by itself on the wiki.
It's worth noting that source is probably the most commonly dropped tag, along with created_by as most people using OSM data and creating derivative databases don't care about those tags. From: Clifford Snow [mailto:[email protected]] Sent: Tuesday, July 02, 2013 4:30 PM To: Paul Norman Cc: [email protected]; imports Subject: Re: [Imports] Tasmanian Parks On Tue, Jul 2, 2013 at 3:45 PM, Paul Norman <[email protected]> wrote: There is no legal requirement that a particular tag be preserved in OSM or by third parties, and the attribution tag is regularly dropped from many derivative databases. The source and attribution tags are for mapper convenience, not legal requirements. Paul, for clarification, is this spelled out anywhere on the wiki?
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