Disclosure limitation is the process for protecting the confidentiality of data. A disclosure of data occurs when published statistical information identifies either an individual or business that has provided information under a pledge of confidentiality. The techniques used by the Census Bureau to protect confidentiality in tabulations vary, depending on the type of data.
To limit disclosure, statistics for two or more CBP ports may be combined and published under an arbitrary designation, or shipping weight or value may be excluded from an individual CBP port. In addition, value and shipping weight for a commodity may be placed in separate ports. Consequently, statistics for individual ports may be understated or overstated due to the suppression of the weight or value of the affected commodities. See Suppression below.