<div dir="ltr">Nope. [Free] software exists to strip the protection features from PDFs, which would remove all such traces of that kind. Anyone that can view the doc can remove the protections if they know how.<div><br></div><div>I guess you could subtly add other identification points to each copy of the document itself, like colour printers encoding their identity on each page with subtle yellow dots. But anyone who got their hands on more than one copy of the PDF could fairly easily identify and remove those also.<br><div><br></div><div>John</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 6 July 2017 at 06:30, Joel B <span dir="ltr"><<a href="mailto:onephatcat@earthlink.net" target="_blank">onephatcat@earthlink.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">How about this: you sell the PDF only directly from your website. You generate a unique, password protected PDF for each order including some markers (like the NSA uses) that let you identify the unique owner of the document. You include in the license a hefty fine to be paid if they allow the doc to be pirated. A stolen laptop won't include the password so that would be reasonably hacker proof.<br>
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You sell the whole thing for $150. Since it will have a full text search index it's actually far more valuable than a stack of paper.<br>
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A full text index on cd or internet would also be a great enhancement to the stack of paper.<br>
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Joel<br>
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Sent from my iPhone<br>
<div class="HOEnZb"><div class="h5"><br>
> On Jul 4, 2017, at 6:36 PM, Barry Klein <<a href="mailto:barryklein@cox.net">barryklein@cox.net</a>> wrote:<br>
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> In the light of the recent Electronotes publishing/distribution discussion, what if I were to put my book on a PDF ebook site - what should it sell for and what sites do you recommend me to take a look at?<br>
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> Barry<br>
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