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