Well, I'm SURE that some of efforts have failed right??
Even if they have taken steps to reinforce copyrights on their website, if posters continues to post copyrighted photos, it's still an infringement. It will be considered "failure to take concrete steps to prevent further infringement."
Even if they have taken steps to reinforce copyrights on their website, if posters continues to post copyrighted photos, it's still an infringement. It will be considered "failure to take concrete steps to prevent further infringement."