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The joke is that:
# it is impossible to come up with a rigorous one-bit definition of what constitutes an " Evil " packet, which is a necessarily subjective human value judgment
# even if such a definition existed, you could not trust people to set the bit correctly

The evil bit has become a synonym for all attempts to seek simple technical solutions for difficult human social problems, in particular efforts to implement Internet Censorship using simple technical solutions.

The evil bit also became a noteworthy in-joke in Slashdot . News about the publication of this RFC was posted in Slashdot dozens of times, reworded each time, among other April Fools stories, poking humor on the common criticism of Slashdot often posting duplicate stories. (See also Slashdot Subculture .)

As a joke, FreeBSD implemented this on the same day but removed the changes on the following day.

This RFC has also been quoted in the otherwise completely serious RFC 3675, ".sex Considered Dangerous" (which may have caused the proponents of .xxx to wonder whether the IETF was commenting on their application for a TLD - the document was not related to their application).