What does a dictionary copyright include?

It protects all of the copyrightable content: creative works, such as the particular selection and arrangement of the definitions, but not the words or definitions themselves. So you can't photocopy the dictionary, but you could (in theory) transcribe the factual information, none of which is covered by copyright (in the USA).
Daca informatia vanduta contine doar cuvintele si explicatia lor, atunci nu exista copyright. Nu ai cum sa ai copyright pe o amarata de limba si pe cuvintele ei.