PS Vita "transfarring" question

So I've done a little research, but have not been able to find the answer to one question. Does "transfarring" your save data from lets say the MGS HD collection to the PS3 require you to purchase 2 copies of the game? I've found a thread where someone theorized that they will probably have a code you can redeem on PSN to be able to get a Vita copy when it's released, but to me while that might make sense at first, really does not, unless they update the current MGS HD collection for PS3 that is already out with a code for the Vita version. I guess if anyone has info on whether you need 2 copies to transfar game saves between Vita and PS3 so that you can play on either platform, let me know. Also, if you could site your source, I'd be curious too.