This advert, created by McCann Erickson and featuring the Dylan track Blowin' in the Wind made its debut on prime-time Coronation Street telly mid-February. Since then it has appeared on various global websites as well, but, since McCann had no reason to secure global soundtrack it suddenly disappeared from global websites. Youtube versions suddenly had no sound, instead a notice from youtube that "the soundtrack was removed due to rights issues", and McCann's own facebook page has removed the advert all together. What's the deal here, Dylan sells out, but only to a certain geographical region? He didn't seem to have a problem going world wide web when he sold out to Victoria's secret.
But, since youtube is somewhat like a giant cyber-game of whack-a-mole, you'll be able to find sound copies littered about still, and UK sites, such as Brandrepublic still carry the ad with sound. Hat tip about the soundtrack issue to adgrunt Kgeiger.