I am currently a mock hacking practitioner, and I think the most important advantage of this lecture was the detailed explanation of the file download vulnerability and the accurate countermeasures. I was able to learn in detail why file downloads are fatal, what the principles are, and I think I learned a lot about the methodological aspects used in practice. As you said in the lecture, I plan to listen to this lecture twice more, not just once. If there is a lecture from Creative in the future, I will apply and study without hesitation. Thank you for the great lecture!