This is known as the retrieval and can done through either security or access. Security limits the number of people who can view data. This usually requires a login or code to see the data. For example, if I want to access any work that I have done or my grades I have to use a username and password to login to my account in order to gain access to my information. The only other people that can access these documents are my teachers. You also must make sure that the people who need to view a document are able to. For example, if all the students in a class need to access any documents then the teacher will need to make sure that the document is stored in a place where all the students can access it and no other students can, like a class folder which is only accessible by students enrolled in that class. Or for example my English class has a one note page which is accessed through Microsoft and only the students in my class and my teacher can see