This means players can be transfered or loaned between clubs at any point, and clubs can be brought in from Premiership Clubs - but not sold to them.
The FL's Head of Communications John Nagle said: "Football League clubs will be free to operate under the same ‘open’ system as used last season.
"Clubs will be able to trade freely with each other and with clubs from leagues below The Football League until the transfer deadline on March 25.
"They will also be able to make loan signings from the clubs of the FA Premier League and may subsequently make such moves permanent at any time.
"Our clubs will, however, be unable to sell or loan players to FA Premier League clubs or trade with football clubs outside the domestic league structure until the window re-opens on January 1.
"The League understands that FIFA intends to review the effectiveness of transfer windows at the end of the current season. Therefore it is the League’s intention to participate fully in this review in order to represent the views of its member clubs."