Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you may not assign these terms of service or any of your rights or obligations under these terms of service to a third party . 

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