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Copies or scans can only be prepared and used within the narrow conditions of copyright law (especially Sections 53 and 60).
According to law, reproductions can only be used for private or scholarly use; they cannot be used for commercial purposes. Only small parts of a work or individual articles from journals can be reproduced.
In particular, reproductions cannot be broadly distributed or made publicly accessible.
You are responsible for complying with these and other legal regulations of the copyright law, and you are liable if you violate the law.
You can find the legal provisions at the website of the Federal Ministry of Justice