The only way is to hit them where it truly hurts.
Their profit margins.
Do not buy a single record. Do not download a single song, legally or illegally. Do not go to see a single film in cinemas, or download a copy, Do not buy a DVD in the stores. Do not buy a videogame. Do not buy a single book or magazine.
Wait the 4 weeks to buy them in April: see the film later, etc. Holding out for just 4 weeks, maximum, will leave a gaping hole in media and entertainment companies’ profits for the 1st quarter, an economic hit which will in turn be observed by governments worldwide as stocks and shares will blip from a large enough loss of incomes.