I also agree with what everyone has said about the agreement, they made the error and they can't control what you do with your property. Then, on an additional note, unless they have a DNA test on the snake you rescued and are going buy all of the offspring you produce over the next 10-15 years to test the babies DNA, then you have nothing to worry about
I doubt they could even look at a hatchling and identify what morphs are at play, so they will never know which hatchlings are of his line
kudos on the snake BTW, a pic would be appreciated of the handsome man
-Kibbleswhites, you posted my thoughts even as I typed them