Earlier quoted context omitted.
Holy shit. That is way, WAY crazier than a non-compete. That is saying you can't work at all for a year after your employment terminates, because anything you produce during that time is presumed to have actually been created during your previous employment, and so belongs to your ex-employer. Even if you go and work for a non-competing company in a completely different field, and invent something totally unrelated t…
In Germany that clause would mean they'd have to pay you your full salary for as long as they prevented you from working for someone else. So it'd be a one-year vacation whenever your employment ended, but probably not much use for your career.
Do you think someone in Germany under such an agreement could work for another company that had no presence in Germany or, perhaps, the EU?