JDK 1.2, 1.3, 1.4 are Java 2, they have no different security
model. They use file policy model and security domain. Applet can
be restricted even though they are signed. The security file/domain
rules. The security differences from jdk1.2-1.4 are, there are more
inteligent classes to be use for security purpose, eg: public key
encryption, automatic https, digital signature, etc.
JDK 1.1 uses different security model (sandbox model). Applet can
run with full power if it is signed.
