Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( a ) an electronic or physical signature of the person authorized to act on behalf of the owner of the copyright or other intellectual property interest ; 

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