I am looking for a gratis, off-line program on Microsoft Windows to batch unlock PDF files to make them OCRable in Acrobat.
I unsuccessfully tried https://sourceforge.net/projects/portablepdfunlocker/: it doesn't work on my PDF files, it displays "working x of y file" forever:
(I tried with Windows 7 SP1 x64 Ultimate)
To remove the security on just 1 PDF one can use Chrome -> save as PDF. But I couldn't find a way to batch process with Chrome: How can I save many PDF files as PDF files via Google Chrome? (unless using some ad hoc AHK/Sikuli/etc. scripts)