This is NCAA, and from a
post in 2006 (I don't do college, so I am trusting the orginal post). Seems to appropriate for this discussion.
A.R. 30. A1 is on the floor with the ball lodged between the upper part of the legs. B1 attempts to gain possession of the ball by placing two hands firmly on the ball; however, A1 applies vice-like force with the upper legs, which prevents B1 from gaining possession of the ball.
RULING: A1 has committed a violation. The intent of this Rule is to prevent a player from gaining an advantage by using any part of the leg. Although A1 did not kick or strike the ball with any part of the leg, the player did gain an illegal advantage, which may also lead to undue roughness. Since A1 was not holding the ball in his or her hands, B1's firm placement of his or her hands on the ball does not constitute a held ball.