How to move music video's from itunes to my camera roll?

I have downloaded alot of music video's from the itunes app (on my iphone) but i want to post them on instagram. I usually use the app "free video" to dowload video's from youtube to my camera roll but these arn't on youtube, just itunes. Is there an app i can use? Anyone know?!

Videos or Songs downloaded from the iTunes app are DRM locked and can't be transferred unless your iPhone is jailbroken. If your iPhone is jailbroken then download iFile from Cydia or iFunbox on Windows and open Raw File system and copy those videos manually into your camera roll

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