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why am i unable to password protect a pdf file?

New Here ,
Feb 05, 2018 Feb 05, 2018

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I am trying to add a password to a pdf document.  I go to "Tools"..."Security"... and that's as far as I can go.

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Security digital signatures and esignatures

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correct answers 1 Correct answer

Community Expert , Feb 05, 2018 Feb 05, 2018

Go to File - Properties - Security and select "Password Security" under "Security Method". Select your settings, enter your password, and you're done.

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Community Expert ,
Feb 05, 2018 Feb 05, 2018

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Go to File - Properties - Security and select "Password Security" under "Security Method". Select your settings, enter your password, and you're done.

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Community Beginner ,
Apr 30, 2022 Apr 30, 2022

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This method is not working for me. Neither is the previously successful way of password protecting a PDF doc that I've created myself. At the point where I either Save the doc or Exit & Save - the program renames the file using a number & character hash and tells me it cannot be saved to the folder I've placed it in. This behaviour began after a recent Windows 10 update and persists regardless of logout / login to my PC as well as my Adobe Pro account.

I'm stumped. Also more than mildly annoyed.

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Community Expert ,
Apr 30, 2022 Apr 30, 2022

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Does you use a third-party plugin?

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Community Beginner ,
May 02, 2022 May 02, 2022

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Hello Bernd, thank you for your reply.
I am not using a third party plugin . . . I am generating the PDF using my
copy of Adobe Pro as if it were a printer.
Thnx,
Ag

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Community Expert ,
May 02, 2022 May 02, 2022

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How does you add a password? What version of Adobe Acrobat does you use?

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Community Beginner ,
May 03, 2022 May 03, 2022

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Adobe Acrobat Pro DC - Continuous Release / Version 2022.001.20117
Added the password in two ways . . . using the method described in the blog
post.
Also - and usually - by using the Protect Icon in the side tray and
choosing Protect Using Password.
I've done this (literally) hundreds of times but it is NOT working as it
did before the most recent Windows Update(s).
Attempting a 'Repair Installation' from the Help tab after sending this
message.
Thank you for your time - appreciate the assistance.
Regards,
Ag

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Community Expert ,
May 04, 2022 May 04, 2022

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>...  the program renames the file using a number & character hash  ...

I have never seen this.

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LEGEND ,
May 04, 2022 May 04, 2022

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One possibility is that you installed some security software that is blocking it. Especially ransomware protection. 

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Community Beginner ,
Sep 22, 2022 Sep 22, 2022

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I have the same problem. I have been adding security in this way for many years. In the last 60 days it gives me an error message. I cannot get it to work. I get error 110. I need help with this! I don't have any different settings or security on my computer than I did for the past 5 years of doing this. I can only imagine it's an adobe issue. Something updated incorrectly.

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New Here ,
Nov 02, 2022 Nov 02, 2022

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I have tried both options for password protect and neither is wokring:

  • the 'protect using password' option is greyed out
  • Trying to set it through password properties asks for the existing password in order to set a new password. This is absurd because there is no existing password and therefore I'm trying to set one. 

I pay for Adobe apps and not being able to do something as simple as this despite paying $21 a month is ridiculous. 

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Community Expert ,
Nov 02, 2022 Nov 02, 2022

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"This is absurd because there is no existing password and therefore I'm trying to set one "

The document has a password.

To change the security you need the permission password.

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New Here ,
Nov 09, 2023 Nov 09, 2023

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Have you tried disabling protected mode as this is enabled by default? Its under Preferences>Security [Enhanced] 

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New Here ,
Feb 06, 2024 Feb 06, 2024

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This worked. Thank you

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