This is not correct – there are no mandatory tags, and there is no legal reason why a source tag can’t be removed. Incidentally, source tags are perhaps the ones most frequently removed as osm2pgsql drops them by default.
If you’re looking at doing an import http://wiki.openstreetmap.org/wiki/Import/Guidelines is what you need to read. It’s important to note the requirement to consult with both the talk-ca@ and the imports@ mailing lists. This is important because it means if you missed something else someone else might spot it. From: Bruno Remy [mailto:bremy.qc...@gmail.com] Sent: Monday, April 22, 2013 6:55 PM To: talk-ca@openstreetmap.org Subject: [Talk-ca] Question? * It is mandatory to mention origin and milesim of Opendata, within a tag, for instance "Direction générale des finances publiques - année 2008". Source = http://wiki.openstreetmap.org/wiki/WikiProject_Cadastre_Fran%C3%A7ais/Conditions_d%27utilisation
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