content: The key does not allow software to be installed on your computer, it verifies that the firmware being downloaded to the router is valid.  If someone can own your router then they can probably own your computer, but one is not necessary for the other.  Also, the cert has since expired, but it could call in to question any firmware you may have installed during that time it was active.    It was an incredibly stupid thing to have happened, and someone is probably going to be fired.  But fsociety isn't coming for your porn stash with this key.