Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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4.4 you agree not to use the products for any purposes related to scientific research , analysis or evaluation of the products without the express written consent of headspace . 

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