"All rights reserved"

Why does this so important? 
Well, in Internet is usual to find a lot of information which is copied from on a page but this is not the problem.Actually the problem is that people who copied that information didn't know about the rights reserved because Internet is a platform where information is free but at least, is important who wrote the original post and ask about if you can copy that information or not.
Don't forget to put the bibliography! 
Valeria