Z:gnu-www-ja-nit-india--72da2b-Because remember, if you are u/en

Because remember, if you are using a nonfree program, you don't really know what it does and you have no control over what it really does. You can't tell if there is a back door. There are people who suspect that Microsoft has put a back door into Windows or other software. We don't know, because we can't see the source code, there is no way to find out, if there is a back door. And it is possible also, that some of Microsoft employees put in a back door without being asked to. I heard some of the people working on Windows XP, were arrested, accused of working a terrorist organization and accused of trying to put in a back door. Now, this means, if you are using nonfree software, you have be scared that the company, that is the developer put in a back door, and you also have to be scared that some developers secretly put in a back door, that even the company doesn't know about. The point is, that because you can't get the source code, study it and change it, you are helpless either way.