Adopt java applet to run in browser

I have made an applet to sign pdf documents - using a smart card, in the same folder in which I have my project, and it works fine in netbeans.I use itext and bouncy castle libs.I signed my libs but...,my applet doesn't work in browser it gives me security exceptions.I need you to adopt my applet to run in browser.I will provide applet that runs ok in Netbeans and itext and bouncy castle libs used in [login to view URL] must not use additional files needed for user to install.