My question was put on hold as off-topic because:
Questions seeking advice on company-specific regulations, agreements, or policies should be directed to your manager or HR department. Questions that address only a specific company or position are of limited use to future visitors. Questions seeking legal advice should be directed to legal professionals
I have reworded my question to meet the rules. The question's scoped has changed a little bit, but I still think its a good question that would be helpful for other people (it has 12 upvotes so far), it already has two good answers, and I really think it should not be closed.
Nevertheless, I am sure that:
- It is not limited on company-specific regulations. It applies for lots of companies, as it's a very common limitation in lots of contracts. I didn't even have to copy the referenced part from my own contract: I've just picked it out from a huge list of similar contracts I've found after some googling.
- I'm definitively not looking for a legal advice. I'm looking for an advice on how I should handle this situation. I think it's very clear in the title.
So, please reconsider re-opening it. If you think it still needs more editing or rewording, please tell me how I could improve it.