PDFs Requiring Password to Open When That Option is NOT Configured

TSPAM:
Problem: PDFs that were created WITHOUT a password required to open are asking for passwords before they will open.
Expected Result: PDFs should open without asking for an open password unless they were configured to require a password to open.
Analysis: PDFs were created via export from InDesign CS6 to PDF Version 1.7 (Adobre PDF Library 10.0.1). Document restrictions were defined as, Allowed: Printing, Content Copying for Accessibility, Commenting, Filling in Form Fields, Signing, Creation of Template Pages; other abilities Not Allowed. Restrictions use password security. Require a password to open is NOT set active.
Once posted online, several users report that the PDFs are requiring a password to open.
I can't duplicate that behavior--meaning that I'm never prompted for an open password--in Acrobat X or XI on Windows 7x64 or Mac OS 10.8x or in Chrome, Firefox, Internet Explorer, or Safari on those systems.
The PDFs in question are linked from this page: http://iampariah.com/blog/creative-pro/cs6-keyboard-shortcut-cheatsheets.php

Hi Pariah,
There are two things here, 1) what is the version of the unencrypted PDF, and 2) how was the file encrypted.
The "may not display correctly" message occurs when the version of the PDF file is greater than what the PDF viewer (for us that's either Acrobat or Reader) understands. As an example, when Acrobat 1.0 came out 20 years ago it only understood PDF version 1.0. When Acrobat 2.0 was released it understood PDF version 1.1 and earlier. By Acrobat 8 it understood PDF version 1.7. If you had a PDF file that was version 1.7 and you opened it in Acrobat 7 (which I'm sure you've figured out only understands PDF v 1.6) then you'd get the "may not display correctly" message. Acrobat 7 would do its best to render the PDF, but if it came across something it just didn't understand it wouldn't (couldn't) display it.
Encryption is a bit different. Let's say you encrypt a file using Acrobat 10 and use the AES 256-bit encryption algorithm. If someone where to try and open the file in version 8, which only understands AES 128-bit encryption the the file could never be opened.
Finally there is the issue about how the password is saved. Acrobat 10 and later use a different methods of Unicode normalization and canonicalization then previous version, so if you've save a password using the Acrobat 10 or later settings then earlier versions cannot properly check that the password you've typed in matches what the document author set. I know this message thread started with the notion that there is no Document Open password, but it's not quite that simple. There really is a password, its just set to "NULL". However, Acrobat (and Reader) versions 9 and earlier cannot reconcile "NULL" set in 10 as they would "NULL" set in 9 and before. Thus, when the file tries to open in an earlier version you get prompted to reenter the password.
Steve

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PDFs Requiring Password to Open When That Option is NOT Configured

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