If someone buys something for you as a gift, through the wishlist, it's yours.  They have no access to it on their members' account screen.

If you and your wife use the same computer, you're golden.  It's transferring the files to make duplicates so that it's on 2 computers is when you get in trouble.  You may not make copies with the intent to redistribute, meaning you can't make a copy for a friend, you can't upload it to a server, you can't make discs to hand out to anyone.
What you can do is make discs for backup.  You can place a copy of them on a backup hard drive.  If you want more specific info, you'll need to contact the store administration.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.