We recognize a firm of Brazilian citizens and foreign citizens who are RNE. More information at http://saofrancisco.itamaraty.gov.br/en/reconhecimento_de_assinaturas.xml
Not at all. If the document is from Brazil the same will be recognized firm in Brazil, if the document is from the US the same is notarized by the American notary authority. There are dozens of possibilities for this question, I advise you to visit the Consulate website for more information.
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