The system, which began this season, allows a team to protect 37 players.
Under the plan, which went into effect last Wednesday, teams can protect 37 players.
The rules in hockey protect players only to a degree.
That said, it is impossible for the league to completely protect players.
Each of the 29 other teams is allowed to protect eight players on its roster.
Each of the 26 contributing teams will initially protect 15 players.
Existing clubs can protect 15 players for the start of the draft.
The four teams were allowed to protect two players and a goalie.
They will protect many other younger players, some at the expense of veterans.
Each team will be allowed to protect 37 players.