Authorization read-write control of the Java Security mechanism control file

In the Java java.policy This file, the definition of some information, such as Grant, is to authorize certain files, similar to liscense files,

This file takes a sandbox pattern, encapsulates a number of allowable ranges, enhances security,

For the Java.policy content:

Standard extensions get all permissions by default Grant CodeBase "file:${{java.ext.dirs}}/*" {Permission java.secur ity.
Allpermission;

}; Default permissions granted to all domains grant {//allows no thread to stop itself using the Java.lang.Thread.st
	OP ()//method that takes no argument.
	This this permission is granted by default to remain//backwards compatible. It is strongly recommended so you either remove the permission//from this policy file or further restrict it to C
	Ode sources//that your specify, because Thread.stop () is potentially unsafe.
	This is the API specification of Java.lang.Thread.stop () for more//information.

	Permission Java.lang.RuntimePermission "Stopthread";

	Allows anyone to listen on un-privileged ports permission Java.net.SocketPermission "localhost:1024-", "Listen";
	"Standard" properies that can is read by anyone permission Java.util.PropertyPermission "Java.version", "read"; Permission Java. util.
	Propertypermission "Java.vendor", "read";
	Permission Java.util.PropertyPermission "Java.vendor.url", "read";
	Permission Java.util.PropertyPermission "Java.class.version", "read";
	Permission Java.util.PropertyPermission "Os.name", "read";
	Permission Java.util.PropertyPermission "Os.version", "read";
	Permission Java.util.PropertyPermission "Os.arch", "read";
	Permission Java.util.PropertyPermission "File.separator", "read";
	Permission Java.util.PropertyPermission "Path.separator", "read";

	Permission Java.util.PropertyPermission "Line.separator", "read";
	Permission Java.util.PropertyPermission "Java.specification.version", "read";
	Permission Java.util.PropertyPermission "Java.specification.vendor", "read";

	Permission Java.util.PropertyPermission "Java.specification.name", "read";
	Permission Java.util.PropertyPermission "Java.vm.specification.version", "read";
	Permission Java.util.PropertyPermission "Java.vm.specification.vendor", "read"; Permission Java.util.PropertyPErmission "Java.vm.specification.name", "read";
	Permission Java.util.PropertyPermission "Java.vm.version", "read";
	Permission Java.util.PropertyPermission "Java.vm.vendor", "read";
Permission Java.util.PropertyPermission "Java.vm.name", "read";
 };