# Free D

Free D is a protocol used in broadcast and virtual production to transmit real-time camera tracking data, including position, rotation, and lens settings, enabling precise alignment of virtual elements with live-action footage. It ensures seamless integration of digital content in augmented reality, virtual sets, and other applications requiring accurate camera movement synchronization.

[MRMC](../../motion-control/mark-roberts-motion-control-mrmc)\
[Re:tracker Bliss](retracker-bliss)\
[Vive Mars](htc-mars-camtrack)\
