Sun's Java BHO – SSV.DLL
Ssv.dll is a browser helper object that installs with the Sun Java Runtime Environment and Java 2 Platform Standard Edition 5.0 Update 6 or later. It will appear in your c:\Program Files\Java\jre_1.5.0 folder (name varies with version number). SSV stands for Secure Static Version. It is a feature that allows an HTML file to specify which JRE family to run.
For more information about this feature, please see the documents Deploying Java Applets With Family JRE Versions in Java Plug-in for Internet Explorer: http://java.sun.com/javase/6/webnotes/family-clsid.html and the alert Java Plug-in and Java Web Start May Allow Applets and Applications to Run With Unpatched JRE: http://sunsolve.sun.com/search/document.do?assetkey=1-26-102557-1.
If you're getting errors that mention ssv.dll on your Windows Vista machine, the problem could be due to a known bug. The Java Runtime Environment (JRE) 6u1 fails plugin-test on some Vista machines. You'll find more information at http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6540679.
While this is not a malicious file, some users have opted to disable it using WinPatrol or to turn it off within the program via "Manage Add-ons".
You'll find Sun's available FAQs that cover all of Sun's J2, J2SE, J2EE and J2ME components at http://java.sun.com/reference/faqs/index.html.
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Sun Microsystems