Here is a question about this article: In the past, many organizations have claimed ownership of patents related to MP3 decoding or encoding. These claims led to a number of legal threats and actions from a variety of sources. As a result, uncertainty about which patents must be licensed in order to create MP3 products without committing patent infringement in countries that allow software patents was a common feature of the early stages of adoption of the technology.
What is the answer to this question: Legal threats and confusion made it difficult to ensure what about patents regarding MP3 products?
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So... which patents must be licensed

Here is a question about this article: Jeffries and Ryan (2001) argue that the modern concept of separation of church and state dates from the mid-twentieth century rulings of the Supreme Court. The central point, they argue, was a constitutional ban against aid to religious schools, followed by a later ban on religious observance in public education. Jeffries and Ryan argue that these two propositionsthat public aid should not go to religious schools and that public schools should not be religiousmake up the separationist position of the modern Establishment Clause.
What is the answer to this question: What was the central point of the rulings of the Supreme Court's rulings?
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So... constitutional ban against aid to religious schools

Here is a question about this article: Hoover began using wiretapping in the 1920s during Prohibition to arrest bootleggers. In the 1927 case Olmstead v. United States, in which a bootlegger was caught through telephone tapping, the United States Supreme Court ruled that FBI wiretaps did not violate the Fourth Amendment as unlawful search and seizure, as long as the FBI did not break into a person's home to complete the tapping. After Prohibition's repeal, Congress passed the Communications Act of 1934, which outlawed non-consensual phone tapping, but allowed bugging. In the 1939 case Nardone v. United States, the court ruled that due to the 1934 law, evidence the FBI obtained by phone tapping was inadmissible in court. After the 1967 case Katz v. United States overturned the 1927 case that had allowed bugging, Congress passed the Omnibus Crime Control Act, allowing public authorities to tap telephones during investigations as long as they obtain a warrant beforehand.
What is the answer to this question: In what supreme court case was it ruled that FBI wiretaps did not violate the Fourth Amendment?
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So...
Olmstead v. United States