Velorien comments on Harry Potter and the Methods of Rationality discussion thread, July 2014, chapter 102

[Velorien]

(I guess the question is whether the Horcrux spell falls under the Interdict!)

Chapter 39:

Voldemort stole the book from which he gleaned his secret; it was not there when I went to look for it.

[hairyfigment]

Yes, but Dumbledore probably can’t create an Horcrux. The Defense Professor claims the known description is wrong, which could make the theft a piece of misdirection. This is another possible way around the Interdict; publish a fake version of the spell which hints at the truth.