Strange people here...Shizhao said, that he uploading only free licensed photos.
It means: Panoramio - > Settings -> Pin NOT by All Rights Reserved, but by SOME RIGHTS RESERVES and by Allow commercial use? and, I think, Allow modifications?
Anyway, I can't understand how it is possible to protect photos, which you uploaded to internet for copying.. If it is property, which You don't want to share with others, first what You need to do, You need NOT upload photo to the internet :) You can, for example, present the exhibition in the library with no permission to take photos with cameras :) if You want to stay safe...
For my personal opinion, all my photos are property by all Internet community and, as we know, only sharing of your good things is power of improvement of our world.