The risk of mixing free and non-free
If you are reading this you probably use free software. In fact, I think the probability that you are reading this article using free software is extremely high, whether it is “free-as-in-speech” as in Firefox, or “free-as-in-beer” as in Internet Explorer. Free software is increasingly being taken for granted and is almost treated as some kind of legal right in some quarters. And so it should be. A lot of people have had to put a great deal of effort into ensuring sufficient “free-as-in-speech” software exists for this to be so.