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Comment by franze | Hacker News Reader

>Of course you can still open an image directly and pin that

well, to counter this scenario pinterest would need to support the

  X-Pinterest-Tag: nopin

HTTP header - for images, PDF, all non HTML data (similar to googles "standard" X-Robots-Meta: noimageindex, see: https://developers.google.com/webmasters/control-crawl-index...)

As a side note, you are not supposed to use X- anymore. http://news.ycombinator.com/item?id=3539663

That is still a draft document, and has not been accepted as a BCP (Best Current Practice) RFC yet.

Or the more generic

    X-Allow-Repost: no

But why don't they just look at EXIF data for copyright/license and respect that?

because that's expensive and time consuming.

"It took too long to check, so I violated your copyright." ?

I guess the real reason is that the EXIF data has the typical metadata problem: its not accurate at all.