As Scott said, never assume that's the best there is. someoneSomeone, somewhere has the clean art.
My favorite way to try to find vector art is to search for the company name and PDF. soSo in this case, search for "Governo de Portugal PDF".
almostAlmost every time, I can find a newsletter or something that the designer exported the PDF with a vector logo in it. youYou can then open the PDF in Illustrator and pick out the logo from the document.
Int heIn the case of this logo I found the PDF of their brand guidelines (jackpot!) here: http://www.promar.gov.pt/Download/Beneficiarios/Normas_Graficas_MAM.pdf
If you download the PDfPDF, Page 11 has the vector art in Black & White. PagePage 19 lists the fonts to use for the Secretario part.
And here is the vector art for dgARTES: http://www.naodamores.com/marcos/Dosier%20Danza/marcos%20de%20contenido/IMAGENES/Logos/CORNUCOPIA.%20PATROCINIOS/logo_dgartes_vertical.pdf