Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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the virtual items , as well as other digital content traded or exchanged for virtual items can only be used within the respective digital product , can not be transferred to a third party ( unless a transfer is permitted within the digital product ) and can not be exchanged for legal tender or any item or right outside of the digital product . 

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