Can a comcast cable box be used on any tv?

Hello,

A friend gave us a comcast cable box from their house. they are still paying for the services but had an extra box. when we hook the box up to our tv, some channels work and some don't, randomly. how can we fix this, if possible??
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More about comcast cable
  1. you can't. the cable company sends an authorization code to determine which channels are viewable.
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