Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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our logos and any other fitbit trademarks that may appear on the fitbit service , and the overall look and feel of the fitbit service , including page headers , graphics , icons , and scripts , may not be copied , imitated or used , in whole or in part , without our prior written permission . 

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