SitePoint Sponsor

User Tag List

Results 1 to 11 of 11
  1. #1
    We like music. weirdbeardmt's Avatar
    Join Date
    May 2001
    Location
    Channel Islands Girth: Footlong
    Posts
    5,882
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Protecting documents.

    Hey, I'm pretty sure I know the answer to this, but... how do people who sell eBooks online protect them? i.e. from being copied/resold/available for free FTP etc.?

    Why? I've got an idea for a small pamphlet/book thing. Not too long - about 30 pages or so as a PDF. I want to sell it for a very small fee. What measures can I take to protect it from being sold on again and again? I'm not thinking "not much", but maybe some clever folk out there know something?

    Many thanks!
    Matt
    I swear to drunk I'm not God.
    Matt's debating is not a crime
    Hint: Don't buy a stupid dwarf Clicky

  2. #2
    chown linux:users\ /world Hartmann's Avatar
    Join Date
    Aug 2000
    Location
    Houston, TX, USA
    Posts
    6,455
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    I think there is a way to password protect the file. You basically stream it, and they type in the password and they are temporarily given access to the file. This is how streaming movies work for things like CNN and FoxNews.

  3. #3
    SitePoint Wizard ChrisRoss's Avatar
    Join Date
    Jun 2002
    Location
    MI
    Posts
    2,535
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    With a full version of Acrobat you can password protect a PDF. You can also make it so they can't print, level of access, set up trusted user certificates, make it so they can't copy and more.

    Or simple protection is to zip it and encrypt it many programs will do this for you. It just make an EXE or ZIP file that asks for a password when extracting.
    Golf Outings? OutingCaddy.com
    Organize - Invite - Create Free website for your golf outing!

  4. #4
    SitePoint Wizard ChrisRoss's Avatar
    Join Date
    Jun 2002
    Location
    MI
    Posts
    2,535
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Here is a good link for user certificates:
    http://www.adobe.com/epaper/tips/acr5secure/page3.html
    Golf Outings? OutingCaddy.com
    Organize - Invite - Create Free website for your golf outing!

  5. #5
    ..back with a vengeance... Ingoal's Avatar
    Join Date
    May 2002
    Location
    Benningen, Germany
    Posts
    6,260
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by iwinweekly.com
    With a full version of Acrobat you can password protect a PDF. You can also make it so they can't print, level of access, set up trusted user certificates, make it so they can't copy and more.
    True, but tbh that can be circumvented within seconds with the corresponding tools...so my answer would be: there's no way to really protect it while it's in pdf-format...

    On another: then again there isn't a cheap and quick real secure method either (if you don't allow download, you can still use snapshot-tools or circumvent it; if you use password protection like mentioned above: not really secure - and even if the user doesn't use a tool to remove the pw (s)he can still hand over the pdf with the password; etc)...

    Ingo
    Advisor - Community Team
    CHD-magician + + =
    Some of my sites: [1|2|3|4|5|6|7|8|9|10]
    Newest site: ZZ.GD - t dsn't gt mch shrtr thn tht

  6. #6
    SitePoint Wizard ChrisRoss's Avatar
    Join Date
    Jun 2002
    Location
    MI
    Posts
    2,535
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Ingoal
    True, but tbh that can be circumvented within seconds with the corresponding tools...so my answer would be: there's no way to really protect it while it's in pdf-format...
    Thats real wrong... If you can crack Trusted Certificates that are 1024-bit RSA private key and X.509 public key certified... I got a job at the NSA for ya.

    Password protecting a PDF and setting up Trusted User Certificates is a big difference.
    Golf Outings? OutingCaddy.com
    Organize - Invite - Create Free website for your golf outing!

  7. #7
    SitePoint Wizard ChrisRoss's Avatar
    Join Date
    Jun 2002
    Location
    MI
    Posts
    2,535
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    But your still right about snap shots.
    Golf Outings? OutingCaddy.com
    Organize - Invite - Create Free website for your golf outing!

  8. #8
    ..back with a vengeance... Ingoal's Avatar
    Join Date
    May 2002
    Location
    Benningen, Germany
    Posts
    6,260
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by iwinweekly.com
    Thats real wrong... If you can crack Trusted Certificates that are 1024-bit RSA private key and X.509 public key certified... I got a job at the NSA for ya.
    Hehe...true true...I read over the Trusted Certificates part, sorry,...1024-bit is quite something...I guess that would do it...although as I said: you cannot control the human element, but that should do it from the technical side...
    Advisor - Community Team
    CHD-magician + + =
    Some of my sites: [1|2|3|4|5|6|7|8|9|10]
    Newest site: ZZ.GD - t dsn't gt mch shrtr thn tht

  9. #9
    We like music. weirdbeardmt's Avatar
    Join Date
    May 2001
    Location
    Channel Islands Girth: Footlong
    Posts
    5,882
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks guys, but as Ingo pointed out, when they download, I'd have to dish out the password, so if they want to make it available, they just give the password with it.

    (thanks for the link, though, I'll look into it!)

    Matt
    I swear to drunk I'm not God.
    Matt's debating is not a crime
    Hint: Don't buy a stupid dwarf Clicky

  10. #10
    We like music. weirdbeardmt's Avatar
    Join Date
    May 2001
    Location
    Channel Islands Girth: Footlong
    Posts
    5,882
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That self-sign security looks good. Now I wonder if the PHP PDF tools let you dynamically generate one of them... (not that it'd be any good for what I want to do, but still, interesting...)
    I swear to drunk I'm not God.
    Matt's debating is not a crime
    Hint: Don't buy a stupid dwarf Clicky

  11. #11
    SitePoint Addict
    Join Date
    Jul 2001
    Posts
    326
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Instead of PDF, you could do it with HTML using :

    HTML Executable 3.1
    http://www.gdgsoft.com/htmlexe/features.aspx

    Password protect whatever you want, say, make the first page available upon download or from CD. Then for subsequent (after the teaser) page(s), the user would have to input the password. Sales and password generation could be dished from :

    Kagi
    https://support.kagi.com/index.php?x=&mod_id=2&root=55

    Never tried the program, but heard about it from somewhere ?...


Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •