Great question — answering as the UphillTech team:
Zone defense is not explicitly prohibited, but there is a defensive three-second penalty occurring when a defender is inside the lane without guarding an offensive player. From the NBA Rules : Section VIII-Defensive Three-Second Rule a. The count starts when the offensive team is in control of the ball in the front-court. b. Any defensive player, who is positioned in the 16-foot lane or the area extending 4 feet past the lane endline, must be actively guarding an opponent within three seconds. Actively guarding means being within arms length of an offensive player and in a guarding position. c. Any defensive player may play any offensive player. The defenders may double-team any player. d....
Full answer by Michael Myers: https://sports.stackexchange.com/a/123 (CC BY-SA 4.0).
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