A method for controlling accuracy of information sent by a sender device using policies comprising: at the sender device receiving a first value representing a numerical measurement, estimate or prediction; at a packager of the sender device assembling a package based in part on the first value by: encrypting the first value to produce a first encrypted value; generating according to a first policy a second value from the first value where the second value has a reduced accuracy with respect to the first value; encrypting the second value to produce a second encrypted value; and concatenating and signing at least the first encrypted value and the second encrypted value using a private sender key; at the sender device, sending the package, wherein the package, when received by a receiver device, is unpacked to extract one of the first value or the second value in dependence on one or more policies; and, when received by the receiver device, is transferred by the receiver device to a second receiver device, wherein the package, when received by the second receiver device, from the receiver device, is unpacked to extract one of the first value or second value in dependence on one or more policies, assembling by the receiver device, a second package based on the second value and one or more second policies; and sending by the receiver device, the second package to the second receiver device, wherein the second package when received by the second receiver device, being unpacked to yield a third value representing the numerical measurement, estimate or prediction and having a reduced accuracy with respect to the second value, the accuracy reduction depending on the first policy and the one or more second policies. at the sender device receiving a first value representing a numerical measurement, estimate or prediction; at a packager of the sender device assembling a package based in part on the first value by: encrypting the first value to produce a first encrypted value; generating according to a first policy a second value from the first value where the second value has a reduced accuracy with respect to the first value; encrypting the second value to produce a second encrypted value; and concatenating and signing at least the first encrypted value and the second encrypted value using a private sender key; encrypting the first value to produce a first encrypted value; generating according to a first policy a second value from the first value where the second value has a reduced accuracy with respect to the first value; encrypting the second value to produce a second encrypted value; and concatenating and signing at least the first encrypted value and the second encrypted value using a private sender key; at the sender device, sending the package, wherein the package, when received by a receiver device, is unpacked to extract one of the first value or the second value in dependence on one or more policies; and, when received by the receiver device, is transferred by the receiver device to a second receiver device, wherein the package, when received by the second receiver device, from the receiver device, is unpacked to extract one of the first value or second value in dependence on one or more policies, assembling by the receiver device, a second package based on the second value and one or more second policies; and sending by the receiver device, the second package to the second receiver device, wherein the second package when received by the second receiver device, being unpacked to yield a third value representing the numerical measurement, estimate or prediction and having a reduced accuracy with respect to the second value, the accuracy reduction depending on the first policy and the one or more second policies. and, when received by the receiver device, is transferred by the receiver device to a second receiver device, wherein the package, when received by the second receiver device, from the receiver device, is unpacked to extract one of the first value or second value in dependence on one or more policies, assembling by the receiver device, a second package based on the second value and one or more second policies; and sending by the receiver device, the second package to the second receiver device, wherein the second package when received by the second receiver device, being unpacked to yield a third value representing the numerical measurement, estimate or prediction and having a reduced accuracy with respect to the second value, the accuracy reduction depending on the first policy and the one or more second policies.