How to stop people from downloading Flickr Photos?

Zilla is a free photo/video backup assistant that helps you to keep your memories backed up to your Flickr account.

Trusted by users in 130+ countries.

Flickr facilitates all its users with a set of features and tools. Using these settings Flickr allows you to control who can view the original version of your photos. Just select a setting — from "Only Me" to "Anyone." This setting applies to all your photos and is combined with your privacy settings.

People often confuse themselves with 'Creative Commons' license settings. They think applying a Creative Commons license to their photos will restrict others from downloading. Unfortunately, the originals can be downloaded by anyone. So, if you don't want to make the originals available, don't apply a Creative Commons license to your images.