Copyright is automatic, registration not required
Copyright protection is automatic as soon as there is a record in any form of what has been created (there is no official registration). Such is called the requirement of 'fixation'. The usual media of fixation are paper, tape, video tape, electronic or digital recording devices such as computer hard disk, optial disk, CD and floppy disk.
When copyright material is published many would mark the work with the international copyright symbol c followed by the name of the copyright owner and year of publication. This is not essential in Hong Kong, but may assist the copyright owner in infringement proceedings, and will be needed in certain foreign countries.