Unit 1 In this unit, you will learn what is meant by the term, Proprietary Software. Visit this site for a definition of proprietary software.   Next, visit this other site for another definition. Activity 1 Open a word processing program (like Microsoft Word) and define Proprietary Software in your own words.   Do you think that Microsoft Word is proprietary software?  Justify your answer. What advantages and disadvantages do you think there are to using proprietary software?