IP-based access is the default access method when accessing the service without login or a key.
A Key-based access requires inserting an identification key (a long alfa-numeric string) in the text box below.
An empty or wrong key will back up to IP-based access.
All access methods may set a limit to the number of requests per hour and their total number.
A value for the request limit equal to "n/a" means no access.
A value equal to "-1" means unlimited requests.