Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
tripadvisor is not responsible for content on websites operated by parties other than tripadvisor . 

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