No. They simply click a link in their email to access it - they do not need any additional passwords or accounts.
They do have the option to create a password if they want long-lived access to their received message. If they do create a password, they automatically get a free Encyro account.
We believe it is in fact easier to send documents using Encyro rather than by email since documents are delivered instantly and there is less frustration associated with missing attachments or email delays.