This document provides an introduction to live closed captioning for broadcast. It defines key terms like closed captions, live closed captions, voice writing and stenography. It explains that live captioning requires highly trained professional captioners and focuses on comprehensibility with 95-98% accuracy. Best practices include providing prep materials, using a strong network connection and highly trained captioners. Virtual encoders are growing to deliver live captions to online streams. Relevant US and Canadian accessibility laws like the CVAA and AODA that regulate closed captioning are also summarized. The document introduces 3Play Media as a premier media accessibility provider that offers captioning, transcription, subtitles and audio description services.