<p>Creates a data protection policy for the specified log group. A data protection policy can help safeguard sensitive data that's ingested by the log group by auditing and masking the sensitive log data.</p> <important> <p>Sensitive data is detected and masked when it is ingested into the log group. When you set a data protection policy, log events ingested into the log group before that time are not masked.</p> </important> <p>By default, when a user views a log event that includes masked data, the sensitive data is replaced by asterisks. A user who has the <code>logs:Unmask</code> permission can use a <a href="https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_GetLogEvents.html">GetLogEvents</a> or <a href="https://docs.aws.amazon.com/AmazonCloudWatchLogs/latest/APIReference/API_FilterLogEvents.html">FilterLogEvents</a> operation with the <code>unmask</code> parameter set to <code>true</code> to view the unmasked log events. Users with the <code>logs:Unmask</code> can also view unmasked data in the CloudWatch Logs console by running a CloudWatch Logs Insights query with the <code>unmask</code> query command.</p> <p>For more information, including a list of types of data that can be audited and masked, see <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/mask-sensitive-log-data.html">Protect sensitive log data with masking</a>.</p>

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