All of the following statements about patents are true except: a. in order to be patented, an invention must be nonobvious. b. t
he four types of inventions protected by patent law are machines, manmade products, compositions of matter, and processing methods. c. computer programs can be patented. it is more difficult to obtain a copyright than it is to obtain a patent.
Explanation:The short version of the rule is that you cannot be prosecuted more than once for the same crime. It prevents prosecution for the same crime after an acquittal or a conviction, and it also prevents imposing multiple punishments for the same crime.