What is meant by the term patent?

The term "patent" when used in the context of describing something as clear or obvious fits best with the meaning "clearly apparent or obvious." In general use, when something is described as "patent," it connotes that it is evident or easily perceived without ambiguity, much like how a patent can represent a clear legal right to an invention.

The other choices do not accurately convey the common understanding of "patent." For instance, 'open to interpretation' indicates that something can be understood in multiple ways, which contrasts with the idea of being clear. 'Exclusively legal' suggests a limitation to legal contexts only, which is not a broader, more general meaning. 'Highly confidential' implies secrecy and a lack of transparency, opposing the clarity suggested by the correct answer. Thus, understanding "patent" as something that is clear and obvious aligns well with its typical use in various contexts.