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' 'Jurisdiction' 'Content removal'
 'Limitation of liability' 'Contract by using' 'Unilateral termination'
 'Arbitration' 'Unilateral change' 'None'].