Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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( a ) an electronic or physical signature of the person authorized to act on behalf of the owner of the copyright or other intellectual property interest ; 

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