For the first blank, the clues “pirating software” and “downloading software from unapproved sources” describe unauthorized activities, so illegal is the best fit. Uncommon and difficult are incorrect because the sentence says that “many people continue to do so.” If people are doing something despite its illegality and “almost as if they were unaware that such acts amount to theft,” you could describe them as acting brashly. Unabashedly is the best fit.