new: fileBee is signed with a key from a Certification Authority. -> signed 

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What does it mean ?
In my own words:

Full Java Webstart Programs (Applications) need to be signed.
For that i've created a certificate with a little java program which everybody can download at java.sun.com for free.
The program is a part of sun's Java 2 Platform Standard Edition (J2SE 5.0)
The same program extract a key which can be used to sign the Java Webstart Program Files.
Self signed certificates are NOT signed by certificate authority (CA) and are free of cost.
CA's signed certificates are expensive and normally used by Web Business (...enter you credit card number...)

The meaning for Java Webstart Programs:
Immediately after downloading a Java Webstart Programm and before starting it a Confirmation Dialog appears.
The point is the dialogs-display-message difference

Self signed programs: "It is highly recommend not to install and run this code"
A certificate from a certificate authority (CA) changes the message in the Window into some nice to read...

Important for the Java Webstart User: You can cancel or confirm starting the Program !
Either a trusted CA certificate nor a self signed one knows if a programm is god or bad!

Read more... Self-signed certificate (wikipedia)