This question is irrelevant because the answer to the next ones...
> 2.- Is it legal to take screenshots of the maps?
> 3.- Is it legal to take screenshots and put them on a pdf document
> (for example)?
...is No (to both).
> If I had a license (a paid one) of Google Maps I could take screen
> shots and put them in PDF documents?
Possibly, but I don't think that's mentioned in the Terms of Service.
You can read them for yourself at
http://code.google.com/apis/maps/terms.html
You don't get controls. It's static.
> May I save that picture? May I put it in a PDF document (for example)?
That's in the Terms as well, at 10.1.1(h). I think the answer to both
those questions is no.
That said, there are derogations to allow up to 5000 *printed* copies,
but that doesn't include saving the images or creating PDFs. Just hard
copy. That's in 3.1(a) of the Legal Notices (link at Term 1.2(a)(ii)).
You will obviously need to save the image to produce the hard-copy,
but the saved image can only be used for that.
If you're particularly concerned, you need to pay a lawyer. I'm not a
lawyer and this is not counsel's legal opinion.