Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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you may not assign these terms of service or any of your rights or obligations under these terms of service to a third party . 

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