Sending .pdfs using Outlook causes them to be encrypted
I'm using Adobe Acrobat Pro (most recent version as of this post) & Outlook 2007 (out of date I realise but it's the company's software) for an office email. If generate/download a .pdf document & email the document to an external email for some reason the recipient can not open the file, saying it is encrypted. I don't have this problem with every .pdf just the odd one. Even if they are from the same file path on my computer. What am I missing here? I don't actually encrypt the files, as far as I know; there isn't a need; the information isn't sensitive.