to receive the rights of a negotiable instrument without the obligation of the seller who formed the contract.
一般用在法律合同或条文里面,意思是不用承受法律责任而承受义务或者物质.
比如：
such a buyer takes free of a perfected security interest in the inventory,even if he knows of the security interest,unless he knows that the sale is in violation of the security agreement.
这样的买家可以免除货物的保证义务,即使他知道他所购买的货物本身是被抵押物.