Thanks a lot for all the inputs.

I´ve just tryed Lingua::Identify, but it suffers from the same problem as the other module: simply not trustable for small strings. For example, is says "Big Cat" is italian, "Deux chansons" is italian, and "Open bridge" is deutsch. So, you can see how problematic it would be to use it.

I´ve checked ispell and it seems there are some word lists there maybe I can use. I´ll have to look closer, but at first they look not as extensive as necessary.

As for the ISBN idea, the problem is that I don´t have the isbns for these books. And regarding fetching other online databases, I don´t think they´ll be trusted to have books in all languages, at least Amazon has just failed this test a few moments ago.

I think I´ll have to free the beast to crawl out the world. (Wow, chill out, I´m not the messenger of the apocalypse! Just some metaphor! hahahah)

If you guys think of something, please let me know.

Take care, fellow monks

André