English translation: proprietary intellectual property
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Explanation: "Sole and exclusive license shall be granted the employer by the employee to all proprietary intellectual property created in his work..."
intellectual property is the official term, you could add the "creative" before property, but it's really included in the term, so I'd reformulate it into the work provided....you didn't ask about "urheberrechtlich" but since "proprietary" is often used in the context, I though I'd add it.....