GARAK: When Senator Vreenak arrives, you will show him a holographic recording of a secret meeting held at the highest level of the Dominion in which the planned invasion of Romulus is being discussed. You will tell the Senator that this information was obtained through various covert means at great cost to the Federation. At least ten good men lost their lives bringing it across the line, that sort of thing. He will immediately suspect it's a forgery, but you will assure him that such a thing would be impossible. You see, Senator, this is an official Cardassian transcript. It was recorded on a one time optolythic data rod used for official record keeping. These rods are manufactured only as needed on Cardassia Prime. Information can only be transcribed on them once, and then cannot be altered.