If pubs get sky installed then they have to pay a huge fee for this privelage. To prove that they have got the correct card in their sky box a pint glass on the bottom corner of the screen will appear. If this pint glass does not appear it means that they are using a sky card which is meant for residential viewing and not viewing in a pub. This is illegal and can result in the pub being fined.
Not sure if it is the same with cable
