on the contrary--there's only one way for {any programs he's got} to do anything with the date on my computer, and that's through a form submission (hidden or not) that feeds some sort of actual data back to his server. The only < form > on the site is on the homepage, and all it does is... well, nothing.
CDUniverse has a decent writeup about CK; the spectrogrammed image is a black-and-white version of the cover, with all text removed.
A possible start point for keywords: try finding ones that are 9, 12, or 18 letters long (the longer gibberish text is divisble by those three).