I'm trying to protect a file by making it an "owner-locked" file, so that other users can't save or export. I go to File -> File Security -> and there's an option to Password Protect the file, or Owner-lock. The latter is greyed out.
Elite - If your save your file as a new file using File > Save as...in the lower right side part of the Save dialogue under Security you can set various file security features, including Owner-locked. We will look at why the File > File security > Owner-locked option was greyed out...may be a bug.