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  1. #1
    3 Star Lounger
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    PDF files and security

    I want to disribute and sell a large PDF file. Those who manufactured it invested a good bit of money in it, and we'd like somehow to make it difficult to copy once it's been downloaded. Has anyone any ideas as to how we might set about doing this?

    many thanks

  2. #2
    Super Moderator jscher2000's Avatar
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    Re: PDF files and security

    You can't actually prevent copying of the file, but using the standard password scheme you can limit access to its contents to those with passwords. The PDF file format provides for limits on use such as restricting printing, and restricting copy and paste, but I'm not aware of any way to prevent screen shots from being made.

    I had a two week trial of the Safari bookshelf system, which included one free chapter download. The chapter is watermarked on every page with information about me and my account, and lots of copyright warnings. If that's not too heavy-handed, and wouldn't blow your production budget, you could consider something like that.

  3. #3
    Platinum Lounger
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    Re: PDF files and security

    Hi Philip

    This appears to be a good link Adobe Security You may get some ideas from it and test it.
    Jerry

  4. #4
    Uranium Lounger
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    Re: PDF files and security

    I often need to extract data from Requests for Proposal in PDF's in order to make a fee proposal to the PDF issuer. I have several tricks up my sleeve, but there are two things that stop me dead in my tracks:

    1. Use every bit of security mentioned in Jezza's link. Without that security, I can copy or extract the text.

    2. I really hate this one: make a very high quality lossless graphic image of the content you plan to distribute, and then import the graphic images into the PDF, rather than the source. I hate that one with a passion, even if I can hack into the content, there's still no text to extract.

    As Jefferson points out, someone with a scanner and good OCR software can't be stopped. But they can be slowed down by low contrast text/backgrounds, and complex table layouts.
    -John ... I float in liquid gardens
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  5. #5
    3 Star Lounger
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    Re: PDF files and security

    Thanks for all of these suggestions--I'll get working

    Philip

  6. #6
    Plutonium Lounger
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    Re: PDF files and security

    I sometimes buy fairly expensive PDF documents from the International Standards Organisation (http://www.iso.org). They put my name, and a statement saying that the document is licensed for my personal use only, up the side of every page.

    StuartR

  7. #7
    5 Star Lounger ibe98765's Avatar
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    Re: PDF files and security

    take a look at PDF Ownership Guard:
    http://www.armjisoft.com/?page=pdfownerguard

  8. #8
    3 Star Lounger
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    Re: PDF files and security

    URL made clickable by HansV - see <!help=19>Help 19<!/help>

    Thanks to all. I've done some independent googling, and found http://www.verypdf.com --given the relatively low technological sophistication of my clients, that might be enought.

  9. #9
    5 Star Lounger
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    Re: PDF files and security

    <hr>I often need to extract data from Requests for Proposal in PDF's in order to make a fee proposal to the PDF issuer.<hr>
    I also used to a couple years ago. Once we received a 200+ pages RFP in the PDF format. The funny thing is they had disabled printing permissions. How would they expect anyone to read that on the screen? Fortunately they had forgotten to password-protect the document -- so all we had to do is manually enable permissions and save the document. I'd add this one as 1.1. in your tricks list <img src=/S/wink.gif border=0 alt=wink width=15 height=15>.

    Edited to add: ough, that wasn't your tricks list but your headache list. My mistake. I feel your pain in N
    <img src=/w3timages/blue3line.gif width=33% height=2>
    <img src=/S/flags/Argentina.gif border=0 alt=Argentina width=30 height=18> <big><font color=4682b4><font face="Comic Sans MS">Diegol</font face=comic></font color=4682b4> </big>

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