Are any subjects or contents off-limits for publication in &quot;free-speech&quot; countries? Even if a government claims to respect "freedom of speech," are there any topics that can be prohibited from publication? Examples might be Uncle Fester books or WikiLeaks.
What a country claims to be the case certainly doesn't guarantee what is the case. The constitution (at least as of 2012) of the Democratic People's Republic of Korea (aka North Korea) says: Article 67. Citizens are guaranteed freedom of speech, the press, assembly, demonstration and association. The State shall guarantee the conditions for the free activities of democratic political parties and social organizations. Needless to say, North Korea is not generally considered a bastion of free speech. The People's Republic of China has a similar provision in its constitution. When we get to countries where those outside the country consider there to be some level of freedom of speech, there are still restrictions. In the UK, the Official Secrets Act makes it a crime for any person to republish leaked classified information. Germany makes it illegal to deny that the Holocaust happened. Until 2013, Canada made it illegal for a person to use telecommunications to say something that would expose people to hatred for some reason covered by antidiscrimination law. Many, many countries criminalize child pornography. Many, many countries have copyright laws. "Free speech" does not mean "you can say whatever you want and the government can't stop you." It means "as a general rule, the government can't restrict what you're saying because they don't like it." I am unaware of any country with a functional government with unfettered freedom of speech.
The Soviet Union generally had no copyright treaties with the western world before 1973. So, anything before then is public domain. The USSR had a policy of public domain and considered anything published to be the property of the "people", including anything published in the west. Even for works produced after 1973, they would have to be registered for copyright in the United States to claim a copyright here.
The question reads: I see an NDA as a pseudo-public document, something you need to read in detail before you acknowledge and opt-in to limit rights (discussion of topic/tech). Unfortunately for this view, the law normally sees an NDA as a private contract, except when it is alleged that it violates public policy. If an NDA explicitly or implicitly includes itself in the list of things not to be disclosed, then posting it would be a violation of the contract. In such a case the party posting the agreement would be subject to whatever consequence the agreement specifies for violation, unless that person had a valid defense. The operator of a web site where the document might be posted would not normally ne a party to the agreement, and so would not be liable for hosting it, unless some other limitation applies, beyond the NDA itself. An NDA can indeed be a significant limitation on the signer's freedom to discuss certain topics, and a person would be wise to consider it in detail, and perhaps consult a lawyer, before signing one. But that does not mean that the person should post or distribute it publicly, nor that the person is automatically entitled to consult NDAs that others have signed. There are sufficient sample NDA forms available that a person can compare an offered NDA with other possibilities, and get an idea if an offered NDA goes beyond the usual terms.
A statement cannot be libel unless it actually identifies the plaintiff to defame him. The identification need not be by name, but it must be specific enough that the public would be able to determine who the statement referred to. You can read more about this concept at Prof. Eugene Volokh on Libel Law Therefore, if nobody other than the plaintiff or defendant learned about the connection before the filing of the case or the publication of discovered emails, the original work of fiction was not a libel. And by telling everyone that the connection existed, yes, the plaintiff was impliedly consenting to any further alleged libel and it would be a defense from liability for the plaintiff. Furthermore, there wouldn't be libel unless whatever the fictional character did was untrue (something the real plaintiff didn't do) and the public would think that whatever the character did was actually an assertion that the real plaintiff did it. I could write a satire about a President Brock O'Bama who is actually a lizardman in disguise, and that's my First Amendment right, not a slander of the President. Disclaimer: only describing the common law and majority rules. State laws may differ.
One example is Sweden. Ebba Busch, the leader of the Christian Democrat party, accepted an order of summary punishment for writing in a Facebook post that the lawyer of her opponent in a real estate dispute has a criminal conviction, which is true. She said, &quot;I admit having committed a crime, that I in my soul and heart consider myself innocent of. [...] But in Sweden, even the truth can be libel.&quot; A professor of civil law commented: &quot;I'm a bit worried that there could be a campaign for true statements on social media always to be permitted, it would amount to terrible consequences and a negative development. In Sweden, libel law has been used to counteract spreading of revenge porn and sex videos of young women. Truth is not unimportant, it is taken into account in the libel process. It would be a negative development if it became allowed to spread everything that is true, in that case you'd need a more precise proposal about how you would permit certain actions and not others.&quot;
There are venue restrictions where political speech is restricted, such as on military bases; content restrictions (transmitting classified information to the world); you cannot defraud by saying false things in order to get something, you cannot defame a person, you cannot speak obscenely (though it's hard to tell what counts as "obscenity"). You cannot appropriate other people's property in speaking (i.e. copyright law is a restriction on speech). The type of speech restrictions seem to pertain to speech and violence caused by such speech. A classic limitation is that you cannot speak "fighting words" (Chaplinsky v. New Hampshire 315 U.S. 568), which in 1942 meant calling someone a "damned racketeer" and "damned Fascist", which the court characterized as "inherently likely to provoke a violent reaction". The court subsequently refined its position on "provocative" speech. In Virginia v. Black 538 U.S. 343 a law against cross-burning was found to run afoul of the First Amendment as a restriction on political expression, but it would be fully consistent with The Constitution to outlaw "cross burning carried out with the intent to intimidate". This states may "prohibit only those forms of intimidation that are most likely to inspire fear of bodily harm". The current position is that you cannot incite to the imminent use of force. In Brandenburg v. Ohio 395 U.S. 444, the court stated that the First Amendment does not "permit a State to forbid or proscribe advocacy of the use of force or of law violation except where such advocacy is directed to inciting or producing imminent lawless action and is likely to incite or produce such action". There are myriad laws against threats, for instance in Washington you may not "knowingly threaten(s) to cause bodily injury immediately or in the future to the person threatened or to any other person", and you can't do that ("knowingly cause another to believe that the offender will cause serious physical harm to the person or property of the other person") in Ohio either. You can't get away with threatening "to commit a crime which will result in death or great bodily injury to another person" in California. This class of restrictions on speech seems to be quite robust. You may not induce panic in Ohio, e.g. shout "fire" in a theater -- I don't know if any other state has such a law.
Sure: No Constitutional rights are totally unencumbered. Even natural rights like the "right to life" are legally "infringed" through various theories (e.g., self-defense, capital punishment, warfare). The Second Amendment has been interpreted as a right to keep and bear weapons that would reasonably be used in self-defense or in military service. You don't have to go to strategic weapons like nukes to find "reasonable infringement" of that right. For example, even though the military and even police routinely use explosives, individuals are absolutely subject to the whims of a federal regulatory agency (the BATFE) as well as state restrictions if they want to keep and bear detonators. Also, I'm not aware of an absolute prohibition on the possession of nuclear devices by non-government entities. E.g., various government regulators oversee private entities that operate commercial and research nuclear reactors and other activities that put them all-but in possession of nuclear arms. If an individual really wanted to legally keep and bear a nuclear weapon it could probably be done with enough money and oversight. (Amendment: Except, as cpast points out in the comments, that there is a law against private possession of nuclear weapons in the U.S. Which just goes back to the broad answer to your general question: In practice there are no unencumbered rights. Constitutional "rights" might better be called things that require "strict scrutiny" and "narrow tailoring" of government infringement.)
Taking the US as an example, the Constitution states Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances. Congress or a state government hasn't prohibited you from comparing platforms. Another private entity has. And, that's fine. You're free to launch the app as a separate website, or print out the flyers and hand them to people on the bus, or publish your own monthly magazine comparing various platforms, so you still have freedom of speech and of the press. As an example, if you write a letter about how great the government of North Korea is to the letters department at Stamp Collectors Magazine, and they don't publish it, have they violated your human rights? The app store restriction may be quite dumb. After all, the built-in web browser allows the reading of the exact same news. But there's no law against being dumb.