Record and time-shift it so that it is no longer "live TV?"
The whole law is antiquated, now you don't need them or their transmission equipment. I do believe that if they move to a subscription model they will lose many customers, especially those with Netflix etc (I don't even know if the aerial cable in my flat works or even own a tv, I use a 43" monitor if I do want to watch anything).
If you own a licence and you're away from home you're allowed to use a device powered only by internal batteries to watch TV -- this is covered by your home licence.
Yes, this leads to ridiculous situations. You watch live tv on your phone? Fine, until you plug in your phone to charge and you're now breaking the law. I don't think anyone has been prosecuted for this type of use.
We used to have B&W licences, and people with colour VCrs but B&W tvs were told that they were receiving in colour and so needed a colour licence.
This kind of thing makes TV licencing unpopular.