is available for opening cable, satellite 'boxes'. I believe it's called a security torx tool.
Here's a look at the many styles available:
http://www.tamperproof.com/index.cfm?fuseaction=products
Here's look at a soucce for the tools:
http://www.wihatools.com/indexes/indxSecuritytorx.htm
I believe you need a T-15 size.