Maybe not. The PDF probably has an embedded text (so it doesn't blur when zomming in) but it could be either cinverted into vector curves or protected from copy

Maybe not. The PDF probably has an embedded text (so it doesn't blur when zomming in) but it could be either cinverted into vector curves or protected from copying (see properties). The easiest way is to change the PDF export settings in Word/Ghostscript/Distiller.