It's been MANY years since I did this, but if you have a hex editor it is possible to change the password to default as long as you had the machine the file was saved on (which I had all since the KN800). Save a file with your own password, load up sequencer, then composer etc etc, in the editor to find the locations where the 2 digits are saved, they are quite close to the beginning of the file. Now you can either find the password in the protected file, or change it to your password, or look up the default ascii for no password in a clean file and substitute. This certainly worked from KN800 up to KN3000 or 5000. I never had to do this on 6000 and later files and suspect it may not be possible since compression was introduced which would negate a simple substitution unless the header was outside the compression algorithm. I seem to remember the only password protected retail files I came across were KN2000 sequences or thereabouts.