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According to Security SE it is highly recommendable to cover your email address in publicly available documents. I'm aware of the discussion about handling email addresses as images: Crawler Resistance Email Address

Anyhow, I'm looking for a non-image solution to this problem: Is there the possibility to make use of Unicode characters (that might be not recognized by the crawler software) in combination with XeTeX?

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Untested: accsupp package from the oberdiek bundle, perhaps? My idea is to have two layers: one visible (PDF) and the other invisible (for crawlers). My next idea is to hide it as a layer using ocgx, but I am afraid that crawlers can still see all of that. –  Malipivo Mar 31 at 10:25
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Did you read the Security SE answer pointing out that such trick as a pain for legitimate users without actually achieving anything? –  Joseph Wright Mar 31 at 10:25
    
Ah, that is an interesting trick mentioned in that answer: convert an email address to outlines, but then a simple OCR scan can find it, I'm afraid that is the same problem as with images included in PDF files. –  Malipivo Mar 31 at 10:30
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Not Unicode-related, but still my favorite obfuscation: john.doemy@pantsfoo.com โ€“ to e-mail me, remove my pants. (from Super Userโ€™s Does e-mail address obfuscation actually work?) –  doncherry Mar 31 at 10:35
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Do you really get enough spam to make it worth it? My email address has been in plain text on latex and other source files since before the UK joined the internet and I don't see that much spam (I get sent a lot, up to several thousand a day when there's a bad virus like sobig going around) but I just have a very aggressive spam filter (and allow my ISP and gmail to filter as well) –  David Carlisle Mar 31 at 11:34

2 Answers 2

You can do this: [๐š–๐˜บ๐—ป๐•’๐’Ž๐•–@๐•–๐•ฉ๐™–๐˜ฎ๐“…๐–‘๐™š.๐–ผ๐˜ฐ๐—บ] instead of myname@example.com but note this is real text so a non-spam user isn't prevented from copying the address and perhaps not noticing that it is unlikely to work. (If the bit between [ and ] isn't readable you may need to install some fonts to cover that range)

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Generated with ewellic.org/mathtext.html which lists among its features: Confuse your enemies by obfuscating your text! Annoy the hell out of the Unicode Technical Committee! –  David Carlisle Mar 31 at 10:47
    
This program seems to be Windows(R) only, so I will have to try it when I get my handy on such a machine. –  DL6ER Mar 31 at 11:19
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@DL6ER yes although it's a trivial transposition of the character codes up to the math alphabet range, so you could just write it in tex directly. I just always liked the release comment (especially as I was shown it by a member of the said Unicode committee:-) –  David Carlisle Mar 31 at 11:23
    
Because obviously, square square square square square is much better than real email addresses. (Translations: fonts are fonts and this solution is less than ideal) –  Doorknob Mar 31 at 21:04
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@darthbith firefox works of course as well, on chrome yes even v 36 (canary release) doesn't show most of the characters. Browser bugs is browser bugs. Of course they don't affect the actual question (which was assuming pdf rendering) –  David Carlisle Mar 31 at 23:34

the randtext package may help; its ctan catalogue entry says

<description>
The package provides a single macro <tt>\randomize{TEXT}</tt> that
typesets the characters of <tt>TEXT</tt> in random order, such that
the resulting output appears correct, but most automated attempts
to read the file will misunderstand it.

This function allows one to include an email address in a TeX
document and publish it online without fear of email address
harvesters or spammers easily picking up the address.
</description>

of course, itโ€™s not proof against ocr, but it provides another way to approach the problem.

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Copy-Past the e-mail address with an ordinary PDF viewer gives me a dd r e s s @ e xa m ple . d e. This could be analyzed. I think they are intelligent enough to parse HTML and also PDF before they are looking for addresses. –  DL6ER Mar 31 at 11:08

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