Hi,
I am really hoping that someone can help since this is a serious security issue for us.
We had a document encrypted with a password (required to open it). However, along the way of several rounds of comments and reviews (which includes adding blank pages for lengthy comments), somewhere along the line, the PDF "dropped encryption." It has recently been noted that the PDF opens without password. So, I tried to re-encrypt but it gives the following error: "The document could not be saved. There was a problem reading this document (18)." Considering that there could be a disk I/O issue, I have copied this file to different disks and yet the error remains.
Is there any way, regardless of how user-unfriendly it might be, to encrypt this file? Adding password to the file outside of PDF (e.g. zipping/compressing it with password) is not an option. I am on Acrobat 10.1.7 on MS Windows 7 Professional.
Please help!
Thanks,
Suny