Your registration data will not be passed to 3rd party.
Site may send you automated messages linked to it's functionality (registration data, password restore messages). You may turn off notifications in your profile ("private" option)
Administration will not send you any e-mails which aren't related to functionality of this site.
Passwords stored as encoded strings and administrators cannot see actual words and symbols used.
Your registration data may be passed to legal authorities in case of official investigation.
Your profile will be visible on "Community" page. If you marked your account as "private" it will not be listed in community.
You can protect submitted media files with password to restrict access to it by other visitors.
Administration may see "private" content submitted by users.