The Flickr Downloadr application is dependent on a gateway service for user authentication token handshake and signing of queries with the Flickr.com APIs.
The gateway will store and keep: username, user ID and token for each authenticated users. For users that is not authenticated, nothing is stored. Users must authenticate to be able to query personal photos and make search queries that are marked unsafe.
The application and service does not collect any other information than what is absolutely required for the service and app to work.
The application and service will never share any data with third parties or others.