dl is a file exchange service that allows you to upload any file to a web
server and generate a unique ticket for others to download. The ticket is
automatically expired according to the specified rules, so that you don't need
to keep track or cleanup afterward. dl also allows you to grant an anonymous,
one-time upload for others to send *you* a file, without the requirement of
account management.
dl is usually installed as a "email attachments replacement" due to its
simplicity (though can be used in other ways).
