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What does Copyright mean?
Copyright law protects the creator in their intellectual and personal relationship to the work and the usage of the work. The full legal text is available at http://www.gesetze-im-internet.de/englisch_urhg/index.html.
A commercial publication does not exclude the option of publishing your work Open Access. Most publishers allow delayed archiving in OPUS. You can look up the conditions of commercial publishers in the SHERPA/RoMEO list (Rights Metadata for Open Archiving).
Source: OPUS FAU, the Online publication system of Friedrich-Alexander-Universität Erlangen-Nürnberg