@AC 1450 - Sherlock Holmes
"don't Sherlock Holmes novels fall under public domain books?... I mean they were written a long time ago (don't know when, but they should be old)."
An interesting case. Arthur Conan Doyle died in 1930 so in countries with a "life + 50" copyright rule (such as the country I live in) his novels are indeed public domain. The same also applies in "life + 70" countries, including most of Europe, I think?
However, there is one notable exception. In the US, thanks to the Sonny Bono Public Domain Confiscation Act - or whatever it was called - the cutoff is somewhere in the early 1920s (1923, from memory). And there is no prospect of any titles falling into the public domain there anytime soon.
So, AC, if you live in a life + 50 or life + 70 country, feel free to head off to www.mobileread.com (or lots of other sites) for a perfectly legal, well formatted, Public Domain e-book of all the Sherlock Holmes books - both novels and short stories.