In a snake draft keeper league, each team owner is allowed to retain 12 players in baseball, 8 players in football, which they owned during the previous season eliminating these players from the draft. In an auction league, unlimited players can be kept by the team owner, but they must give each kept player a $3 increase in salary prior to the supplemental draft.
In a NEW keeper league, all players are available to be drafted and their are no keepers.