According BlackBerry, they want to must track the use of some sensitive API.
For the application of new signing keys, you can refers to http://na.blackberry.com/developers/resources/A60_How_And_When_To_Sign_V2.pdf for instructions
BlackBerry will send you 3 files, client-RBB-XXXX.csi, client-RCR-XXXX.csi and client-RRT-XXXX.csi, for registration. And these files will be tied to the installed machine.
Over time, you may change/upgrade your machine and you can reuse the signing keys by copying the following 3 files in the "
After that, you can sign your cod again.