i-net PDFC. I downloaded their trial version (1 month, no restrictions). I tried it on some other documents, and it worked flawlessly. Highlights the differences.
I sent them an email when I failed to get it working on FA, and this is what they said in their reply:
"
Hello,
the stack trace indicates that the error occurs during the decryption process. So your pdf files are encrypted (password-protected). Is this correct? Concerning encrytion, there are some limitations, as described by the following passage from the documentation:
PDF documents with restricted access permissions are partly supported. The PDF documents, having such restrictions, are encrypted. The i-net PDFC parser can read PDF files, if they are encrypted with the standard algorithm, based on RC4. If the revision is not 3 or if the AES encryption, instead of RC4, was used, then such documents can not be read.
Usually, we would ask you to send us the pdf documents so we can reproduce and investigate the error. But if they are password-protected, this doesn't seem to be an option. Or would this be possible anyway?"