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by waterhouse 2255 days ago
I don't know much about the broader context, but to this part:

> If all you have is the URL, then the server sees the encryption key.

Not necessarily. It's possible to put the key after a "#" in the URL, which allows client-side code to use it without sending it to the server. This technique is used at ZeroBin, among other places. (Edit: This is actually done in the video in the OP as well.)