Secure conference systems

Claim 1

A SECURITY SYSTEM COMPRISING AN INNER ACOUSTICALLY ATTENUATING AND SUBSTANTIALLY SOUNDPROOF BARRIER ENCLOSURE DEFINING AND COMPLETELY ENCLOSING A SECURE WORKING ROOM FOR CONFERENCE-RELATED WORK INVOLVING THE PRODUCTION OF WORK-RELATED ACOUSTIC ENERGY, SAID INNER ENCLOSURE BEING CONSTRUCTED AT LEAST ON ALL EXPOSED SURFACES OF MATERIAL IMPERVIOUS TO CLANDESTINE ALTERATION, AN ELECTROMAGNETIC RADIATION BARRIER SUBSTANTIALLY COMPLETELY SURROUNDING SAID INNER ENCLOSURE, OUTER WALL MEANS DEFINING AN ACOUSTICALLY CONDUCTING LAYER OF NON-CRITICAL THICKNESS SUBSTANTIALLY COMPLETELY SURROUNDING SAID INNER ENCLOSURE, AND MEANS FOR FLOODING SAID CONDUCTING LAYER WITH MASKING ACOUSTICAL ENERGY; SAID WORK-RELATED ACOUSTIC ENERGY AND SAID MASKING ACOUSTIC ENERGY BEING SO RELATED TO EACH OTHER IN INTENSITY AND TO THE ATTENUATION OF SAID ACOUSTIC BARRIER THAT ANY WORK-RELATED ACOUSTIC ENERGY PENETRATING OUTWARD THROUGH SAID BARRIER IS ATTENUATED TO AN UNINTELLIGIBLE LEVEL OUTSIDE SAID SAID ENCLOSURE IN THE PRESENCE OF SAID MASKING ACOUSTIC ENERGY, AND BEING FURTHER SO INTERRELATED THAT SAID MASKING ACOUSTIC ENERGY PENETRATING INWARDLY THROUGH SAID BARRIER IS ATTENUATED BELOW A WORK-INTERFERRING LEVEL INSIDE SAID WORKROOM.