There's pretty much zero percent chance there isn't a class-action waiver in the old license agreement. Maybe an arbitration clause too, but that could actually be good, since Sony would probably have to pay the arbiters win or lose, so if enough people actually pursue it it could cost them a boatload.

Pretty much guaranteed "buying" those eps was done under a user agreement that said something like, "You don't own this and we can revoke your license whenever we want for whatever reason we want."