Post signs, and make announcements, warning attendees that the meeting will cover confidential information and that they should not disclose the information without authorization.
Instruct attendees not to discuss any business outside of designated meeting rooms, as other rooms are vulnerable to eavesdropping; and not to discuss business over hotel telephones or analog cell phones.
Instruct attendees not to leave any proprietary information unattended in their sleeping rooms, including luggage and electronic devices, as well as in the meeting room.
Ensure sufficient sound insulation between the meeting room walls and adjoining spaces. Consider requiring that any area on the other side of air walls from the group's space be left empty.
Avoid the use of wireless microphones.
Shred all discarded paper that contains group information.
If you do collect digital devices, place them in a metal box to block signals.
Allow no waitstaff in the meeting room during sensitive discussions.
Station security staff at the meeting room when the room is otherwise unoccupied.
