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class files in jar trusted?

 
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From the sun practice test one of questions states
that
D.Classes loaded from a jarfile on a remote source can sometimes be trusted even if the jarfile is unsigned.
When and how is this the case?
 
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From Java 1.2 onwards what is trusted can be defined by security policy. Have a look at this article:
http://www.javaworld.com/javaworld/jw-11-1997/jw-11-hood_p.html
 
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