Final answer:
The principle that "obscenity is not within the area of constitutionally protected speech or press" was established in Roth v. United States (1957) but was later superseded by the Miller v. California (1973) case.
Step-by-step explanation:
The principle that "obscenity is not within the area of constitutionally protected speech or press" was established in Roth v. United States (1957) where the Supreme Court ruled that obscene material is not protected by the First Amendment. However, this ruling was superseded by the Miller v. California (1973) case, where the Supreme Court established the Miller test for determining whether something is obscene or not.