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Thanks for the answer Greg. The key is that the PDF would be added and linked by users and not by us. If we develope a specific feature in a client online service we might earn some quality backlinks for their domain but only to an isolated PDFs.

Thank you very much Martin!

Thank you! So, considering the new google markup, I think it shoul be right: us.web.com/en for US users in English web.com/en for everyone else in English web.com/es for everyone in Spanish