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Quick search answered my own question - 'U' indicates USA; As a result of cryptographic export restrictions, different levels of security were shipped in early

by petee 9y ago

Quick search answered my own question - 'U' indicates USA; As a result of cryptographic export restrictions, different levels of security were shipped in early browsers: U(SA) = 128bit, I(nternational) = 40bit, or N(one).