The '09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0' meme refers to a specific 128-bit cryptographic key used to bypass the copy protection on HD-DVDs and Blu-rays. In 2007, after the AACS Licensing Administrator attempted to suppress the number through DMCA takedown notices, the internet responded with a massive wave of civil disobedience known as the 'AACS encryption key controversy.' The hex code was posted on Digg, Wikipedia, and thousands of blogs, eventually becoming a symbol of free speech and the Streisand Effect. It is often visualized as a 'Free Speech Flag' with the hex digits representing colors, serving as a reminder of the futility of trying to censor information in the digital age.