This is the Signature of Artur da Costa e Silva, so I guess he is the author. If in doubt: Governo do Brasil
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It is the text of a treaty, convention, law, decree, regulation, judicial decision, or other official enactment. (Law 9610/1998, art. 8)
It is a work whose authors' rights belong to the Brazilian government (federal, state, or municipal), for which the economic rights shall be protected for a period of 70 years from the first of January of the year following that of their disclosure or that of the author's demise, whichever is later. ([1])
يبدو أنَّ هذا التَّوقيع غير مُؤَهَّلٍ لحقوق التَّأليف والنَّشر لأَنَّه لا يُحقق المُستوَى المَطلُوب لإثبات الأَصالة اللازمة للحماية بحقوق التَّأليف والنَّشر في الولايات المُتحدة الأمريكيَّة وفي بلد المصدر (في حال كان مغايراً لها). نتيجةً لذلك، فإِن هذا التَّوقيع يقع في النِّطاق العامّ .
في حال كان بلدُ المصدر مغايراً للولايات المُتحدة الأمريكيَّة، فهذا البلد هو البرازيل.