#java -version
java version "1.6.0-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-rc-b71)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b71, mixed mode)

#cat > Test.java
public class Test{
    public static void main(String[] args){
        System.out.println(Test.class.getResource("/META-INF/services/java.sql.Driver"));
                                                  //Or any resource from resources.jar
    }
}

#cat|sed -e s\!current_dir\!`pwd`\! > test.policy
grant codeBase "file:current_dir" {
};

#java -classpath . -Djava.security.manager -Djava.security.policy=test.policy -Djava.security.debug="access" Test
access: access allowed (java.io.FilePermission /export/Development/security-regression/res-bug read)
access: access denied (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/resources.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/rt.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/sunrsasign.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/jsse.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/jce.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/lib/charsets.jar read)
access: access allowed (java.net.NetPermission specifyStreamHandler)
access: access allowed (java.io.FilePermission /net/archer/export5/re/jdk/6.0/promoted/rc/b71/binaries/linux-i586/jre/classes read)
null

Note that access denied to resources.jar

It is known that at least some of resources are acessed outside of priveleged blocks.