Electronic supplements are generated annually and released in August. (In 2015, the supplement appeared quite late because of my transition to a new job as a Vice Chancellor at UCLA. Many apologies.)
They are cumulative (in other words, the most recent edition casebook + the most recent electronic supplement are all that you need).
- The current hardback edition is the 4th edition, published in 2012.
- The 2015 cumulative supplement is now online.
- Kang 2015 Cumulative Supplement, Communications Law & Policy (uploaded November 08, 2015).
- The 2014 cumulative supplement is still available.
- Kang 2014 Supplement Communications Law and Policy (pdf) | uploaded Aug 18, 2014