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so the topic of todays lecture is whats called digital watermarking and so these days you know back when I was in college right there was this everyone was buying CDs and then even then that was digital right but the idea of ripping CDs and sharing it with your friends and so on didnt really come into play until maybe the late 90s and suddenly all of the content manufacturers realized that they need a way to either lock down or keep track of the digital contents that led to this explosion but just in a in a field so we called water parking okay and so there are mobit you know there are some related terms and so one is called cryptography right so certainly you guys are familiar with that cryptography is basically idea that Ive got some sort of a you know clear information by which I mean you know unencrypted uncorrupted information that I put into some sort of a you know encryption framework that requires a key to undo and then what comes out is basically you know some sort of use
