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