Anyone may perform the following activities:

Drop-off
Drop-off (upload) a file for a UK Data Service user (email verification required).
Pick-up
Pick-up (download) a file dropped off for you.
 
UK Data Service staff: you may login with your username and password and send files to anyone.
Non-UK Data Service users: you cannot log in, but can still send files to UK Data Service staff if you know their email address. Start by clicking the "Drop-off" button.
UK Data Service staff who wish someone outside the organisation to send them files, can make it a lot easier for them by logging in and clicking "Request a Drop-off". That saves the other person having to prove who they are. The request created will be valid for 7 days.
 
 
How secure is UK Data Service ZendTo?

Files are automatically deleted from UK Data Service ZendTo 14 days after you upload them.