So the general theory of unjust enrichment could be applied to protect trademark exclusive rights.
本文拟在阐明不当得利一般原理的基础上，探讨其在商标权民事救济上的适用。
When the assignment is invalid, obligor has the right to restitute from assignee those obligor gives to the assignee and in theory the right is the claim of property right or unjust enrichment.
债权让与无效时，债务人可以向受让人主张返还已经履行的给付，该权利在性质上是物权返还请求权或者不当得利返还请求权。
When the assignment is invalid, obligor has the right to restitute from assignee those obligor gives to the assignee and in theory the right is the claim of property right or unjust enrichment.
债权让与无效时，债务人可以向受让人主张返还已经履行的给付，该权利在性质上是物权返还请求权或者不当得利返还请求权。
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