1. A method comprising: identifying, by a computer system, a policy template that includes information for creation of one or more policies for preventing use-restricted content from being sent over a network; identifying, by the computer system, source data having a tabular structure, the source data including a plurality of data elements having the use-restricted content; and creating, by the computer system, a policy based on the identified policy template and the source data, wherein the policy is used for preventing presence of the plurality of data elements in one or more messages sent over the network, the plurality of data elements having the use-restricted content and being from the tabular structure of the identified source data.