There are such things as secret patents, but they are either orders imposed by the government as they think it would be a risk to national security to publish it,
en.wikipedia.org
or in some exceptional circumstances the publication can be delayed, but for an IH like the Orion, seriously.. come off it
There are also trade secrets too, which could well be Mr. Dee's next little day dream, but then why not say that in the first place.
I have lost track of the number of different explanations now.
The request remains the same, back up your accusations of theft... pretty simple! Any meaningful tangible way will do...