I want a simple system, with the use of browser plug-in. Better to code it in Java, that can be run "on demand" by a user through a web browser (ie or firefox).
The plug-in should be able to play video in browser, and it can do some decryption on the video before the video is played on the screen.
The situation is like this:
A server contains some encrypted video (e.g. DES).
The user use the browser to view the video, but the decryption should be done in client side (by plug-in or any other technique that is similar).