Encrypting URLs for embedded media/files enhances security of your media assets further. With the default URLs, users can view/identify names and naming convention for your media files. By adding encryption, end users (respondents) will not be able to view the file name or replicate any URL patterns to gain unauthorized access to your files.
Go to: Login » My Account » Global Settings
Enable the toggle for Encrypt Media URLs and save.Once encryption is enabled, anytime you add an image or media file to your survey, the encrypted URL will be used to embed the media file securely.