Where on earth does it say that the government cannot limit access to information? If that were true then how on earth is book censorship legal? For that matte

Where on earth does it say that the government cannot limit access to information? If that were true then how on earth is book censorship legal? For that matter, how was it legal to change to digital tv broadcasts? CCP tiktok can absolutely still operate a website that wont be blocked. The medium of delivery isnt protected speech.