Security Question

I tested the notepad sample Application, and noticed that in the jnlp file there is no security tag. Also I saw that the jar file is not signed.The notepad application can read and write files on my local disk.Where are the security restrictions?
[281 byte] By [aweinber] at [2007-9-26 2:23:03]
# 1
When you use the jnlp filemanager (see api), you don't have to go out of the secure box that our working in. And you don't have to sign the application.Wouter
wvtbg at 2007-6-29 9:30:28 > top of Java-index,Desktop,Deploying...
# 2
Thank you very much. I was very worried because we are developing a large application using Java Web Start as deployment infrastructure.Thanks again
aweinber at 2007-6-29 9:30:28 > top of Java-index,Desktop,Deploying...