Tim,

while I haven't tried it myself, it might be worth looking
at the OpenSSL program that comes with recent versions of
Apache/iX. According to the documentation, it is also able
to encrypt/decrypt files similar to...

  openssl enc -e -a -des3 -in inputfile -out cryptedfile

  openssl enc -d -a -in cryptedfile -out outputfile

  (also see http://www.openssl.org/docs/apps/enc.html)

As OpenSSL is a Posix utility, you might need to convert
record-oriented MPE files to bytestream format before doing
encryption and back to MPE record format after decryption.

The OpenSSL crypto routines seem to also be available
in a library, so you might even be able to use them from
an application program.

  (also see http://www.openssl.org/docs/crypto/crypto.html)

Lars.

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