Closed Source Software
This is the opposite of 'Open Source' software.
It means the software is the intellectual property of a specific company.
For example 'Office' is a closed source application belonging to Microsoft. You will not be able to get hold of the source code as it is private property.
With closed source software, the company sells a 'licence' that defines how their customers can use the software. For example the licence may be 'single user' or perhaps 'site licence'.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Open and Closed source software