In simple terms, Major League Baseball (MLB) owners cannot sign free agents during a lockout because all player transactions are frozen. The lockout, a work stoppage initiated by the owners, halts all operations that include players. This means no trades, no signings, and no usage of team facilities by players. It's a tough situation, but it's a tool used by the owners to exert pressure during contract negotiations. Ultimately, the game suffers as the fans eagerly await the resolution.