Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( iii ) violate the restrictions in any robot exclusion headers on this website or bypass or circumvent other measures employed to prevent or limit access to this website ; 

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