Huh. Here I wondered if you had somehow attached a unique ID to the ZIP or PDF file. Doesn't appear so. Any particular reason for deciding on PDF?
Side note: I love it when people say "try to find a different way to protect them." Obviously they have no idea on document protection and removal of said protection.
Also also note: If you really like the PDF method, I'm not sure what level of kick-back there is from it, but Wowio does some sort of advertisement supported free comics. I've seen a few web comics post a rather large archive up there, and I'm not sure why they would do it without some form of reimpersement. Might be worth looking into?
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It's not that I don't like you. I'm just direct.
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