Fair enough, but with those dictionaries one can tell from their names. The Collins and Oxford dictionaries (except those which have "American" in their name) are British; the ones with "Webster" in their name are American. These are all extremely well-known dictionaries.
MobiPocket aren't American-based, by the way; they're French. They are owned
by Amazon, but that's a very recent development; they've been around for many, many years.