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[1] https://www.ifross.org/?q=artikel/open-database-license-odbl-veroeffentlicht
[2] https://www.ifross.org/?q=user/login&destination=comment/reply/23%23comment-form
[3] mailto:axel.metzger@ifross.de
[4] https://www.ifross.org/?q=category/tags/odbl
[5] https://www.ifross.org/?q=category/tags/open-database-license
[6] https://www.ifross.org/?q=category/tags/open-data-commons-project