Replays

So, does anyone know any reliable software to record my games? One that doesn't break down after each patch prefferably. Also, Riot, is there any possibility that you can implement a replay function in the client? A replay software that runs on each player's pc and not your servers so that you don't have to suffer from high data loads. Also, make it possible that people that are in the same game can share the replay with each other in case that a player can't run the replay recording software on their pc due to low performance capabilities...