Protect persistent data using code signing keys

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Import the following classes:
- java.util.Hashtable
- net.rim.device.api.system.PersistentObject

Create a hash ID for the object you want to store in a persistent object.

long MY_DATA_ID = 0x33abf322367f9018L;
Hashtable myHashtable = new Hashtable();

Store the object in the persistent object and protect the object with the CodeSigningKey object. For example, after a BlackBerry device application runs the following line of code, only code files that are signed with the RSAE .key file can read or overwrite the object in the persistent object.
```
persistentObject.setContents( new ControlledAccess( myHashtable, key ) );
```
Make sure that the object is protected, invoke getContents using the CodeSigningKey object as a parameter.
```
Hashtable myHashtable = (Hashtable) persistentObject.getContents( key );
```

Parent topic: Controlling access to APIs and application data