chosen in the Rule 5 draft, a player must be kept on the selecting team's 25 man major league roster for the entire season after the draft--he may not be optioned or designated to the minors. The selecting team may, at any time, waive the Rule 5 draftee, such as when it no longer wishes to keep him on the major league roster. If a Rule 5 draftee clears waivers, he must be offered back to the original team, effectively canceling the Rule 5 draft choice. Once a Rule 5 draftee spends an entire season on his new team's 25 man roster, his status reverts to normal and he may be optioned or designated for assignment. To prevent the abuse of the Rule 5 draft, the rule also states that the draftee must be active for at least 90 days. This keeps teams from drafting players, then "hiding" them on the disabled list for the majority of the season. For example, if a Rule 5 draftee was only active for 67 days in his first season with his new club, he must be active for an additional 23 games in his second season to satisfy the Rule 5 requirements.
Any player chosen in the Rule 5 draft may be traded to any team while under the Rule 5 restrictions, but the restrictions transfer to the new team. If the new team does not want to keep the player on its 25-man roster for the season, he must be offered back to the team he was on when he was chosen in the draft.