This was a simple method of protection employed by some software houses.
A single, unformatted track, usually at the start of the disc was an effective deterrent to casual copying. This defeated *BACKUP but would not defeat *COPY *.* on its own.
Later examples of this technique involved only formatting those tracks needed to store the data. For example, a 40 track disk may only have the first 20 tracks formatted.
Used by itself this is an uncommon method of protection but is found used in conjunction with other methods.
Sometimes this is very difficult because the program is written in a way to defeat editing. In this case a partial re-write may be necessary.
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