Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you agree not to remove , change or obscure any copyright , trademark , service mark , or other proprietary rights notices incorporated in or accompanying the fitbit service . 

```
. OPTIONS: ["Choice of law", "Unilateral termination", "Unilateral change", "Contract by using", "None", "Jurisdiction", "Limitation of liability", "Arbitration", "Content removal"].