Well, a self-extracting and encrypted archive could contain anything,
while this is image "scrambling" so that nobody can see the real
content unless he / she has the passphrase.
Maybe this is good for Artist, wanting a bit of money from their
subscribers or if you have clients which you send images of
confidential rendered prototypes etc.
Sure, one can use encryption software like GnuPG to encrypt
things, also images etc, but this technique allows you to host
images instead of other data.
Regards
Stefan
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