the important file is the ticket. content files are still downloadable for the wii, except the ticket gives a 404 error. I don't think you can decrypt the raw files without the ticket. I'm assuming that someone downloaded them encrypted, because encrypted files on the wii at least have no extension. they require the ticket.
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you may be able to use cdecrypt, but that may decrypt content into code/content/meta. I have no experience with it.
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you may be able to use cdecrypt, but that may decrypt content into code/content/meta. I have no experience with it.