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Originally posted by uberarcanist
Two main possibilities on the possible manipulation in question:
1. Al-Qaeda is "spiffing up" their videos for purely presentational reasons.
2. NSA/CIA are involved in fakery.
He points out that just because the error levels are the same for two items in an image, that doesn't prove they were added at the same time, only that the compression was the same for both items when they were added.