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