Your customers are not required to create an Encyro account. If you send them secure documents, they simply click a link in their email to access it - they do not need any additional passwords. If you use your upload web page to receive documents, again your customers do not need to create an account.
You may also use the Free Trial to experience the ease of use for yourself. Send a secure document to your own email address or upload something on your own upload page to see how easy it is.