UNIT 1 THE WEB

6)EXCHANGING INFORMATION ONLINE
The exchange of files and software has become one of the most common online activities.Every day,people are uploading and downloading more and more song,videos,photos,software applictions and other files.It can be done quickly,easily and automaticaly by using Peer to Peer programs,such as Ares and BitTorrent.
There are legal restrictions that apply to many types of digital content.For example,some tyoes of software are open source,which means the source code is available to the public and can be modified by users.Other types of software are closed source,which means the source code can inly be modified by the programmer.
We can also differentite between the following types of software:
-Free software:Anyone can use,modify,copy and distribute this software.It is also open source.
-Proprietary software:Users need special permission or a lince to use,modify,copy or distribute this software.
-Commercial software:The owner distributes and sells this software for a price.
-Freeware:This software does not cost anything.It can be copied and distributes,but it cannot be modified.
-Public domain software:The author makes this software available to everyone at no cost.