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E-signed PDF Files Became Password Locked Unintentionally

At the time I got e-signed PDF files from our business partner I could open the files. However suddenly the files got password locked although nobody didn't make password lock on the file.

This phenomena happens under specific environments and not happens under another specific environments I write following.

As additional information, I indexed PDF files including above files. Nevertheless almost all of indexed PDF files haven't gotten password locked, so that I cannot attribute the reason of unintentional password lock to indexing.

[Environments Recognize The Files As "Password Locked]
1.
Windows Server 2012 R2 (64bit)
Adobe Acrobat Pro DC
2015.006.30413

  1. Windows10 Pro ver. 1709 (?bit) Adobe Acrobat Reader DC 2018.011.20036

[Environments Recognize The Files As "Not Password Locked"]
1.
Windows7 SP1/ 32bit
Adobe Acrobat Reader DC
2015.008.20082

  1. Window 10 ver. 1607 / 64bit Adobe Acrobat Reader DC 2018.009.20050
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Sugiyama Tomoki shared this idea  ·   ·  Report…  ·  Admin →

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  • Jitendra commented  ·   ·  Report

    Sir how would I know my pdf open password

  • Sugiyama Tomoki commented  ·   ·  Report

    Hi,

    After updating Adobe Acrobat DC to ver.15.006.30417, I could open problem files.

    Thanks.

    -Tomoki

  • Sugiyama Tomoki commented  ·   ·  Report

    (Additional Question)

    Adobe Acrobat Pro DC (2015.006.30413) is included in latest updates you mentioned?

    - Tomoki

  • Sugiyama Tomoki commented  ·   ·  Report

    Hi,

    I have a additonal question about this phenomena.

    1. CAUSATION
    - Is there specific processes for this phenomena
    - This phenomena happens both in "Adobe Acrobat Reader DC" and "Adobe Acrobat Pro DC"?

    2. TEMPORARY SOLUTION
    - How can I unprotect this unintentional-encrypted PDF files which noboy knows that passwords.

    3. TIME
    - As I mentioned above, I would like to know when the fix version will be released.
    (We distributed many PDF files to our clients on daily basis, so this issue really badly influence on our business, and I strongly hope this resolved as soon as possible.)

    Thanks for your kind cooperation.

    -Tomoki

  • Sugiyama Tomoki commented  ·   ·  Report

    Hi,

    You mean fix version of both of "Adobe Acrobat Reader DC" and "Adobe Acrobat Pro DC " will be released?

    When will we be able to get the fix version?

    I'm really happy to hear your preparation for this phenomena.

    Thanks,
    -Tomoki