I'm sure there was some sort of paperwork when M.H. made his donation. It would be interesting to know if he relinquished all rights upon making the bank "deposit", or if there is some sort of clause about what rights he actually does have. Whatever the case, I'm sure the simple donation process will undoubtedly require pages of legal documents in the future.
That's what makes this issue so troubling, he didn't "donate" his sperm, it was intended for his fiance ONLY - it was the clinic's error in giving it to another female. He fully intended to create a baby that he would be there to help raise, not a baby for a strange couple.
He doesn't appear to be some shmoe selling his seeds for profit. It was not a donation for science, it was a donation to his loved one.
He may not have made a general donation, but a donation for use with a specific person's egg. If they used it for someone else, that would be a problem. I still think that the issue should be the clinic compensating him, not him wrecking some family.