Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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be aware that headspace has no control over user material once it leaves the products , and it is possible that others may duplicate material found on the products , including , but not limited to , on other sites on the internet . 

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