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Old 02-03-2009, 08:01 PM   #1
Gunnerp245
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PDF DRM how do you know?

How does one know whether a PDF file has DRM?
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Old 02-03-2009, 08:38 PM   #2
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If you can open the PDF in Adobe Reader, go to Document Properties, security tab and look at "Security Method" if it says anything besides "No Security", it is encrypted (and DRM protected) using the named Security handler. Note: Adobe currently provides 4 security handlers (Password, Certificate, Live Cycle, and eBooks), and there are a multitude of 3rd party security handlers.

If you cannot open it in Adobe Reader, assuming it is a valid non corrupt PDF file, it is probably DRM protected.

If people are interested, I can give the true Geek answer of how to walk the PDF structure in a text editor to find out all of this information.
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Old 02-03-2009, 09:10 PM   #3
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Originally Posted by Gunnerp245 View Post
How does one know whether a PDF file has DRM?
Gunner...
Hello, Gunner, and welcome to MobileRead.

As you can see, we have knowledgeable people here, stick around and you'll learn lots more!
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Old 02-04-2009, 03:53 AM   #4
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If you're asking how you can tell at the time you buy the book, it will, if it has DRM, generally be described as "Secure PDF" in the eBook store.
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Old 02-04-2009, 03:46 PM   #5
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Quote:
Originally Posted by Jim Lester View Post
If people are interested, I can give the true Geek answer of how to walk the PDF structure in a text editor to find out all of this information.
I would love to know this... Knowledge is power...
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Old 02-05-2009, 03:58 AM   #6
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Use "pdfinfo", it comes with poppler in my linux:

Code:
$ pdfinfo dantesinferno00dantuoft.pdf
Producer:       Recoded by LuraDocument PDF v2.28
CreationDate:   Thu Dec  6 09:34:21 2007
ModDate:        Thu Dec  6 10:11:03 2007
Tagged:         no
Pages:          372
Encrypted:      no
Page size:      640 x 912 pts
File size:      37026003 bytes
Optimized:      yes
PDF version:    1.5

Last edited by Jellby; 02-05-2009 at 04:00 AM.
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Old 02-07-2009, 11:13 AM   #7
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Thanks to all!
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Old 12-11-2011, 11:18 AM   #8
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is there a way you guys can remove the 5 pictures you guys have as part of your profile? its annoying to have to scroll through so much white space in order to read the next post....
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Old 12-11-2011, 11:24 AM   #9
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is there a way you guys can remove the 5 pictures you guys have as part of your profile? its annoying to have to scroll through so much white space in order to read the next post....
What 5 pictures? Do you mean the avatars? If so, the answer is no. But you can turn off seeing avatars in your profile. You'll have to go look it up for yourself. I'm not doing it for you with that attitude.
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Old 12-11-2011, 11:27 AM   #10
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is there a way you guys can remove the 5 pictures you guys have as part of your profile? its annoying to have to scroll through so much white space in order to read the next post....
Of course - I'm sure that everybody on the site will be delighted to remove their Avatars for your personal convenience.

Alternatively, you could go into your Control Panel, select "Edit Options", and in the "Thread Display Options" section, uncheck the "Show Avatars" box.
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Old 12-11-2011, 11:49 AM   #11
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I would love to know this... Knowledge is power...
A little late in the reply, but I lost the thread until it got bumped

Open the file in a text editor.
Search for "/Encrypt"
- If you don't find it then your PDF is not encrypted

If you find it then you are most likely in the "Trailer" dictionary which is at the end of the file. There should be entries that look like:
/Root 74 0 R /Encrypt 96 0 R /Info 1 0 R

These specify which objects are the import one in the file.

To find a object search replace the R with an 'obj' and search (most likely backwards) in the file. So if I was searching for the Encryption Dictionary in the above example, I would search for "96 0 obj"

Which would get you something like
96 0 obj
<< /Filter /Standard /V 2 /R 3 ....
>>

The interesting bit is the value for /Filter - in this case it is /Standard meaning the file uses the 'Standard' security handler which is Password Protection.

Last edited by Jim Lester; 12-11-2011 at 04:36 PM.
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