So redemption says Limit once per turn, does that mean the active player (DS) could benifit from the LS card? Or does the LS as card owner have the right to let the interrupt ability be used?

jss_hobbie said:

You control your own cards, that includes any triggered effect. Unless the card states otherwise.

I would like to point out that there are time in which it is very usefule to use this ability on your opponent's characters. That said, it would only be reasonably useful in circumstances where you already have full board control and are trying to prevent your opponent from being able to 'draw out.' as it were.