That was one of the jokes with the original wording. To cover encrypted, as well as enciphered, text it said something like "any clear text that has a hidden meaning".

Which immediately made most of literature and theology illegal. You couldn't posses a poem or a bible unless you could explain to the police any hidden symbolism!

Pictures of the police kicking down doors and shouting "you're nicked - now explain what the poet really meant by a host of yellow daffodils"