We have had a rash of people stealing your photos on Flickr and making use of them! I have spotted your images being used on Etsy Shop banners, MySpace Backgrounds and uploaded to other Flickr accounts without the proper credit being given back to the artist.
We must protect ourselves!
If you're going to use Flick--here are 2 ways to help protect your photos and images.
You can block any user and you must set the proper license for your photos.
Blocking a user is a must. If someone adds you as a contact and they have no photos available to you, no profile information and they just mark your pictures as favorites--they are probably working on copying you or ripping off your images.
I had a user come through and mark 3 pages of my photos as favorites. I blocked them.
Just move your mouse over the person's icon picture and a drop down menu will appear--click on the last option "block".
A new page will open that says...
Next, set your account to post pictures with "All Rights Reserved"
This will protect your images from being saved as targets to someone's desktop.
I hope this helps!