[loeg]

FWIW, (2) doesn't strip any sort of steganographic watermark that might already be embedded in the document, but invisible to the naked eye. Of course, there's no reliable way to do that, anyway. And steganography could be used in ways that are visible to the human eye (i.e., survives printing/scanning) but still imperceptible with a single copy of the document.

[ohithereyou]

You can strip the steganographic watermark by having somebody retype the information from the document, but that doesn't defeat the barium meal.

[loeg]

Not necessarily! Consider rearranged words or punctuation in different versions of the document. You'd have to do something like type up a paraphrase to get around that.