I've read somewhere that content protection prevents an unauthorized user who guesses the correct password to a device from connecting it to a PC and extracting any data stored within. Is this true? Does content protection prevent the actual user of the blackberry from backing up his/her device data on a PC?

How does the BlackBerry know if you're an unauthorized user if the correct password is guessed? C'mon man.....

The ipd file that is created in the backup process can only be restored to the device from the same Windows user that the backup was created.

So in other words, if you back up your blackberry from PC A, transfer the ipd file to PC B and try to do a restore from PC B - it will not work.