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Old 10-27-2010, 06:43 AM   #1
Cenobite
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Question Add copy protection to PDF?


I'm setting up a fileserver for a client which will host their client invoices. They're looking for a system whereby invoices can be converted from RTF to PDF with copy protection (no right click / copy-paste). In addition to this I'm thinking of using a one-way hash to verify document integrity.

Are there any command-line utilities for Linux which allows adding this kind of copy protection / DRM to pdf documents?

Thanks!
 
Old 10-27-2010, 06:51 AM   #2
fbobraga
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Quote:
Originally Posted by Cenobite View Post
(...) PDF with copy protection (no right click / copy-paste).
It's a Adobe-PDF specific feature (and not part of PDF format specification), as far as I know
 
Old 10-27-2010, 06:59 AM   #3
Guttorm
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pdftk can do this.

For example:

pdftk plain.pdf output drm.pdf owner_pw someSecret encrypt_128bit allow printing

This can be printed, but no copying from the document if you don't know the password.

See man pdftk for more details.
 
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Old 10-27-2010, 07:36 AM   #4
Guttorm
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Quote:
It's a Adobe-PDF specific feature (and not part of PDF format specification), as far as I know
It is part of the PDF specification. But of course it's not very hard to modify an open source reader. Some time ago I read about somebody changing xpdf so you could for example copy content without the password. Such a program is legal, but you cannot call it a PDF reader since it doesn't follow the specification.
 
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Old 10-27-2010, 08:32 AM   #5
Cenobite
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pdftk looks like just the ticket!

Thanks, Guttorm!

Quote:
Originally Posted by Guttorm View Post
pdftk can do this.

For example:

pdftk plain.pdf output drm.pdf owner_pw someSecret encrypt_128bit allow printing

This can be printed, but no copying from the document if you don't know the password.

See man pdftk for more details.
 
Old 10-27-2010, 08:35 AM   #6
fbobraga
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thanks for the info :P
 
  


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