I’ve scanned a PDF into DTPO (not an indexed file).
I opened with>Adobe Acrobat Pro 9 and added an encrypted password and saved. This name and icon are in my DTPO Group, but when clicking on the file is says “No Selection”. I can right click and show in Finder and it’s there, in the Files.noindex folder (and password protected).
I’ve Verify and Repaired and it still doesn’t open when clicking on it.
You can set two passwords in Acrobat. One is the Document Open password, the second is the Change Permissions password. If the Document Open password is the only one set, then when you select that PDF in DTPO you’ll see this screen. If the Change Permissions password is set, DTPO will only show “No Selection”.
I’ve noticed that if the password settings are modified, even removing the Change Permissions password does not revert the display back to the password prompt screen. In other words, “No Selection” is persistent. I suspect DTPO doesn’t know that the security settings were changed.
True, PMBOK versions 4+, for example, can’t be viewed in DEVONthink - or so I’ve experienced. The restrictions originate in the filesystem. PDFs with Change Permissions passwords cannot be moved in Finder, for example.