Interesting topic! 
I guess my first question is, what exactly do you mean by “infringement on free will?”
In “normal person” parlance, your query makes total sense in its totality, although it’s a bit of an odd choice of verbiage, I think, to say that Person B is infringing on Person A’s “free will,” per se. I do see why you would suggest that, however – Person A may then feel compelled to keep the gift, which was not asked for, and is not wanted, against his or her desires. This might be considered a bit of a violation of free will, because if Person A is not very strong of will, he or she might feel that they had “no choice.”
In a healthy relationship, mentally and spiritually, between two healthy people, however, I do not believe that it is so. Person B enjoys giving gifts, and thus, he or she must recognize that these gifts will not always be what the recipient wanted and therefore won’t take offense if they aren’t always taken in and used. Person A, meanwhile, has every right to determine what objects go into his or her house, and therefore, has every right to graciously and gratefully accept the gift in essence or in spirit, but not in material reality. In this case, we truly have coined the cliche: “It’s the thought that counts.”
… Because it does! … Just yesterday, two of my best friends came over with the gift of a very beautiful piece of furniture. They had realized only after they bought it for me that I might not have anywhere to put it. Indeed, I don’t, and it’s just not quite what I am looking for at the moment – and I am indeed Person A when it comes to “stuff in my house” at this point in my life. 
However, the joy that my friends felt in buying it for me was very palpable, and I was very deeply grateful and appreciative, and now if I cannot figure out where to put it, we will all have the joy of figuring out who it truly belongs to.
(Then again, all of my friends and I share that in common: We cannot keep a thing that is not “ours.” We must then begin the very joyful and fun task of figuring out who to give it to!)
Okay. All that being said – this is a Law of One forum. Ra’s definition of an infringement on free will is very different from the mainstream. In this case, I would have to suppose that the gift somehow gave the person access to what we, in this space-time, would consider foreknowledge that altered his or her choices in some way. If that is what you mean by this, please elaborate, for I am very curious!
