You are in Argentina? I did a quick search and found a couple indications that Argentina does not have fair use/fair dealing, so I suggest you don't copy or directly translate anything that does not have a license that clearly permits it. But information and ideas are not copyrightable, only the expression of them, so you can still paraphrase without a problem as long as the actual text/whatever of your version is sufficiently different.
Works Not Covered By Copyright and
Idea-expression divide assume U.S., but generally apply elsewhere (with exceptions, so look up your own copyright laws), especially if the copyright is a U.S. copyright and only applies elsewhere due to treaties.
If you want to know about specific content you are interested in copying, you have to be specific about it. Otherwise, I can only give you that general suggestion.
