Can someone clarify exactly what this means in plain English?
The rule is given as
Does this mean I have to provide written consent for each and every player in the squad or for only those who were playing for another squad in the previous season?2.2 After the registration list deadline as announced per rule 1.1 above, a player who has explicitly consented to play for a team may not move to another team unless (a) the captain of that team voluntarily deregisters him/her or (b) the Chief Arbiter considers that it would be inequitable to hold the player to his/her previous commitment, taking into account the circumstances in which the commitment had been given and any relevant evidence subsequent to the giving of the commitment. It is the responsibility of the captain of a team wishing to retain the registration of a player who has agreed to play for that team to provide firm evidence of explicit agreement (which should be in writing or by email, should be dated and should record that the player has been informed of the consequences of giving explicit consent). A player who has given explicit consent to play for a team but who changes his/her mind must contact the Registrations Secretary before the registration list deadline. A player who has not given explicit consent will be considered to be validly registered for the team including him/her on its registration list, but until he/she has played for the team he/she remains free to play for other teams subject to the requirements of sections 3 and 4 of these rules.