[1]http://www.newsfactor.com/perl/story/19028.html
   Token encryption.
   If a user wearing the system's security token walks away from his or
   her laptop, the system senses it and begins securing the computer by
   encrypting all data. If the user then returns within range, the
   computer begins unlocking data so work can resume.

   "Its safe,its very safe!" MM.

References

   1. http://www.newsfactor.com/perl/story/19028.html