Secure Encrypted way of sharing files with other companies

[Rickster]

Private DC++ server with winrar password files?

 

[RVQ]

Yeah Hit the nail on the head

If you looking at just encrypting the transfer of the document from your network to theirs over the internet then an SFTP server should do the trick, if you need to control access to the document after it leaves your network then there's other paid solutions that can I can suggest...