You can share them as you usually would. (by email, Dropbox, Google Drive, OwnCloud, Box, USB…).
You share them through your Cloud Service with the Prot-On option “Share” which will automatically associate your Prot-On and Dropbox, Google Drive, Box… accounts, provide you with a link that you can send to whom you want and allow you to manage permissions to the protected file.
The recipients will receive a link which will allow to view the document in a browser with just one click