From the TV Licensing website:
I thought my parents' TV Licence would cover me.
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Your parents' TV Licence won't cover your use of any TV receiver in student accommodation, except in the following rare and limited circumstances:
* You only use TV receiving equipment that is powered by its internal batteries; and
* You have not installed it (e.g. connected it to an aerial or plugged it into the mains) to receive TV; and
* Your permanent address (non term-time) is your parents' home; and
* Your parents have a valid TV Licence for their home.
If you do not satisfy all of these requirements, you will need to buy your own TV Licence for your student accommodation.
To check whether this exception applies to you, please call us on 0844 800 6721.
[end]
I'm sure then, it would be legal if the USB TV stick came with a built in aerial (as did those portable TVs of the 1990s) and you ran your laptop only on batteries.