Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you agree and acknowledge that the materials are valuable property and that other than any specific and limited license for use of such materials , you shall not acquire any ownership rights in or to such materials . 

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