1. A method for processing left and right eye images of 3D content, comprising: via a data processor, analyzing image data for the left and right eye images to determine a disparity between the images representing displacement of at least one feature from a position the feature would have in a corresponding 2D image; based upon the disparity, determining an anticipated locations in the left and right images, respectively, of a watermark; analyzing the image data for the left and right eye images to determine whether the watermark is detectable in both images; and generating a user notification based upon the detectability of the watermark in the images.