Is there anything yet to prevent abuse? For example, in the case of Cloudinary, they allow signing of URLs[0] to prevent anyone from just using your account to

Is there anything yet to prevent abuse? For example, in the case of Cloudinary, they allow signing of URLs[0] to prevent anyone from just using your account to serve arbitrary images. [0] http://cloudinary.com/blog/on_the_fly_image_manipulations_secured_with_signed_urls http://cloudinary.com/blog/on_the_fly_image_manipulations_se...