Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
gifting codes can only be used once in the country for which they were purchased and can not be redeemed for cash , resold or combined with any other offers , including free trial . 

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