Did you know you can choose who can download your photos from Flickr? You just have to go to this page (within your account) and choose who access the “All Sizes” page for your photos.

A coupla things:

• Any photos with any sort of Creative Commons license will always allow downloads, because that’s sort of the point,
• If you have a free account, your original files aren’t accessible… that’s one of the good things about upgrading, and
• This is a global setting, so if you change it, it applies to all your photos at once.