Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you agree that you are not permitted to resell any products purchased through headspace for commercial purposes . 

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