SVG version of a flag protesting the suppression of an HD-DVD encryption key, see AACS encryption key controversy. 
Text description of the flag by author John Marcotte: 

Free Speech Flag -- Our government has become increasingly willing to sacrifice the rights of its citizens at the altar of corporate greed. As ridiculous as it sounds, even numbers have become “intellectual property” that corporations can claim ownership of. We here at Badmouth think that idea stinks. We want to start a movement, a movement to reclaim personal liberties and decorporatize the laws of our nation.
To that end we have made a flag, a symbol to show support for personal freedoms. Spread it as far and wide as you can. We give this flag away freely, and also give away the rights for people to make similar, derivative works. the colors of the flag are (in hex code format):
#09F911 #029D74 #E35BD8 #4156C5 #635688
The letters "C0" are added to signify that simply publishing a number is "Crime Zero".

Spread the word.
Badmouth, (Archived link)
Alternate link: Badmouth.
See also media coverage of this file, itself, from Slashdot (archived link).
Additional media coverage of the Free Speech Flag:
Bushell-embling, Dylan (May 15, 2007). "Digg finds the key is safety in numbers". Brisbane Times. Archived from the original on September 24, 2015. Retrieved on September 24, 2015.
S, Ben (March 1, 2011). "46 DC EA D3 17 FE 45 D8 09 23 EB 97 E4 95 64 10 D4 CD B2 C2". Yale Law &amp; Technology. Archived from the original on March 10, 2011. Retrieved on September 24, 2015. "A 'PS3 Flag', an homage to its predecessor, the 'Free Speech Flag'"
Thompson, Jeff (August 13, 2011). "AACS encryption key". Jeff Thompson. Archived from the original on September 24, 2015. Retrieved on September 24, 2015. "An example of this is the so-called 'Free Speech Flag', seen above."
Crofton, Isaak (2015)       Crypto Anarchy, pp. 160  ISBN:  978-1329059801. 
Kiyuna, A.; L. Conyers (2015)       Cyberwarfare Sourcebook, pp. 291  ISBN:  978-1329063945.
John Marcotte