In John Scalzi's "The Last Colony", John Perry talks with General Gau when General Gau comes to destroy his colony. Perry instead gives him a chance to surrender which General Gau doesn't take and the conclave's fleet is destroyed. Perry is then called in for a hearing in front of a panel to explain this possible treasonous act. My question is, how did the CDF know what their conversation was about? How did they know what exactly they talked about and that Perry offered Gau a chance to retreat? There is no indication that there was someone nearby recording video/audio. Was Perry wearing a bug/camera or something? Is such surveillance (in that universe) possible from space?