Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you may not assign this agreement without vimeo 's prior written consent . 

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