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

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