Creating a New Policy File
Use policytool to create or edit an existing policy file. This is an example of a policy file created using policytool. It grants two permissions. It grants code signed by ``Duke'' permission to read files located in the user's home directory. It also grants code from the location ``http://someserver/myjar.jar'' (regardless of who signed it) to read the ``file.encoding'' system property. 

 > policytool -file .policy
     
 keystore ".keystore";
 grant signedBy "Duke"  {
   permission java.io.FilePermission "${user.dir}/-", 
     "read"; 
 };
 grant codeBase "http://someserver/myjar.jar" {
   permission java.util.PropertyPermission "file.encoding", 
     "read";
 }