If the pad data can be worked out or is known then the "encryption" is useless. If you use something like a book and the book used is unknown then it could stil

If the pad data can be worked out or is known then the "encryption" is useless. If you use something like a book and the book used is unknown then it could still be found if someone can work out part of your message though guess work. "They sent a 5 letter word, I'm guessing it was "hello" therefore the first part of the book they used must be........". If you send the pad across the internet at all it could be recorded at many points along the way. While it still might not be cracked you'd certainly do better using proper encryption.