Tuesday is an important date in the offseason, though it often goes somewhat unnoticed until it shows up. November 20 marks the date on which teams must officially protect any prospects eligible to be selected in December’s Rule 5 draft. For those unfamiliar, the Rule 5 draft happens at the end of the Winter Meetings. The way it works is as follows. Teams must add eligible prospects to their 40-man roster by the November 20 deadline. If they are on the 40-man, they cannot be selected in the draft. If they are not, they can be selected and the teams that select them must keep the player on their active roster for the entire next season.