Lucinda Hawksley, great, great, great granddaughter of Charles Dickens, has written on the subject of Dickens and Copyright for the Authors’ Licensing and Collecting Society.  It can be accessed via the link below. Many thanks to Lucinda for permission to reproduce it.   
http://www.alcs.co.uk/ALCS-News/2015/June-2015/Lucinda-Hawksley-feature