It isn't a question of whether he or anybody has the right to not disclose any information. Of course he has the right .
The above was speculation as to the reason somebody might want to keep something a secret.
And, on the flip side, doesn't the owner of a book have the right to know what - precisely - is being done on his property, not just the intended (un-guarenteed) end results?
It would be hard to imagine car mechanics getting away with working on a car behind a black curtain and refusing to expain exactly what they are doing and getting away with it....
As I said, I think par tof the explanation is to keep the masses from knowing how simple some of this is...it's a practice in all fields. The high priests mystify things to, well, keep themselves the high priests....