Popular photo sharing site Pinterest has recently been the subject of copyright concern over its handling of third-party content, and on Monday it responded to that concern by implementing a "nopin" code that allows content creators to prevent their works from being pinned. As of today, Flickr has deployed the nopin code, preventing Pinterest users from grabbing copyrighted or protected photos photos from those who have opted-out of sharing or made their content private. A Flickr representative tells VentureBeat that it "has implemented the tag and it appears on all non-public / non-safe pages, as well as when a member has disabled sharing of their Flickr content." Of course, this won't prevent users from simply downloading images from Flickr and re-uploading them to Pinterest, but Pinterest's core functionality could become more complicated if other major content keepers follow in Flickr's footsteps.

Update: We've corrected this story to reflect a nuance in Flickr's application of the nopin code. Flickr is only blocking Pinterest from private photos or those that have been protected by opting-out of sharing.

Thanks, jakerome!