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