What is the use of Oracle Data Masking?

Hi,
Iam using HCM 9.2, PT 8.53, DB.11.2.0.2.
What is this particular navigation does??
PeopleTools >Utilities> Administration >Oracle Data Masking
does this encrypts the value in the specified field??
Suggestions welcomed !!
Aravind.

Repeated start/stop or redeploy causes memory leak (7393267)
Repeated start/stop or redeploy of an application causes memory to leak and the server has to be restarted to clean up the memory. New applications created in JDeveloper 11.1.1.0.1 will be configured with a Weblogic Application Lifecycle Listener to handle this scenario. For older applications migrated to 11.1.1.0.1, the listener will need to be manually added to the weblogic-application.xml of the application to solve this issue.
<listener>
<listener-class>oracle.adf.share.weblogic.listeners.ADFApplicationLifecycleListener</listener-class>
</listener>
From : http://www.oracle.com/technetwork/developer-tools/jdev/knownissues-096030.html

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