One's first amendment rights of free speech do not exempt all expressive acts from prosecution. There is a large body of law that addresses the issue of when expression becomes action. As long as I am not conspiring to commit fraud or some other crime, I can publish your credit card number, or your swiss bank account number, or your income, etc. in a magazine article without fear of government prosecution. And I believe that ability to express things that make some people uncomfortable is a vital part of basic American liberty. Leichter's second example involves restrictions on a company selling credit or other private records.
Commercial speech is regulated very differently than individual speech.
Commercial entities do not have the same free speech rights that individuals do. Leichter concludes by recommending a couple of science fiction stories about social control of information. Any abridgement of a constitutional right must either balance a competing right or serve some compelling state interest. Surely the routine prosecutorial needs of the state can be met without recourse to such invasive, undiscriminating measures. Technology can be used either to enhance or degrade the status of rights such as freedom of expression and privacy.