In case you want your content to be published by a publisher after having disseminated the content (or a former version of it) via LDH, you might have to specify it in your accompanying letter to the publisher. Please indicate that you have granted a CC license or a non-exclusive usage right to the MPG’s institutional repository for your work.
Some publishers ask the author in their license or their Copyright Transfer Agreement to warrant that the content has not been published before. Depending on the publisher, this might include a publication on an institutional server as well. Note that this is a matter of editorial policy, not a requirement by copyright law!