What is a single word antonym of censorship? Freedom of speech is too long. I would like to be able to contrast it like:
ignorance vs knowledge
submission vs defiance
oppression vs freedom
I'd just say "free speech." Choose function over form; getting the meaning right is more important than hewing to the one-word meme, if communication is the intent.
I think in this context, your best choice is "expression". Censorship restricts or prohibits expression. If you can live with two words, "free expression" works nicely.
Depending on where you want to use the word, permissiveness might suit your needs.
Noncensorship is found in some books listed by ngrams
I would say tolerance to describe an attribute of such a positive society which does not indulge in censorship. Other options could be maturity, in a broader sense; or liberty of life.
The only one-word antonym I can think of is "sanction", but I don't think that works in this case. It only applies to a single instance. That is, you can say, "The government censored the publication of this book" versus "The government sanctioned the publication of this book". But I've never heard someone say, "I believe in the right to vote and sanction" as an alternative to "... the right to vote and freedom of speech".
As with many nouns, censorship, the application of censoring..., has no antonyms. One will will be compelled to find a combination of words, unless the context allows for a foreign word, which in the case at hand, is doubtful. A hyphenated word combination or phrase is likely the closest to a single word that could be found, as the other posts attest.
Press or speech laissez-faire would be an expression which seems to run quite rigorously as a reversal of meaning of censorship.
Latitude (see meaning 4). And an upvote for permissiveness.
Diligence is the antonym for censorship. Censorship is any attempt to under value the works of others.
Notice the prefix Di means two. Diligence is the ability to respect another and one's self as two. With diligence in place one cannot project one's own limitations upon others.
The suffix in "diligent" is gent similar to gentleman one whom can talk out their problems instead of committing savage acts of ignorance such as censorship.
Autonomy describes the surrounding conditions of no censorship.