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Open source encryption is usually stronger that the closed source. But the thing is encyption works with two keys; one their side, one on ours. As long as we have our own key, it will be broken. If Apple's Fairplay isn't broken, than it would be because noone spent the effort needed.
There couldn't really be an unbreakable DRM as long as we have our own key and an encrypted ebook file. There could be DRM very hard to break, but unbreakable with a known key? Not really. Only if they also stop giving us ebook files. This is what B&N did, no? I don't really know what they did.
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