At 09:02 PM 11/25/98 -0800, Marvin wrote: It's hard to imagine a scheme that couldn't be broken using a simple deck-to-deck "bit copy" of the audio, or the equivalent of what we're discussed with digitizing. I *can* imagine schemes to prevent the simple load-save copy via the computer. If the cassette loader format included a "load at given address" function, you could make a tape that replaced a RAM-based vector to the loading routine itself. Similarly, if the tape loading process included a "jump to address after loading", the tape could include a short loader in the standard format, then continue loading data in a different format, rinse-lather-repeat. - John