As far as I understand pinning means copying from source to your own page with help of Pinterest. So if I take Flickr analogy, pinning would mean downloading a

As far as I understand pinning means copying from source to your own page with help of Pinterest. So if I take Flickr analogy, pinning would mean downloading a photo from user A, and uploading it to your own album. So obviously you have to have copyright to pin something to your own page. The fact that pinning is much faster then "download/upload" is irrelevant to copyright discussion: you are still uploading stuff to your own page. Is my understanding correct? So what is all these fuss?