http://www.rsasecurity.com/developers/total-solution/faq.html
JLF Sends...
In particular, we really needed to have a commercially packaged
version of Perl for the Windows folks, because many of them were (and
still are) clueless about open source. It's almost like we're doing
Windows users a favor by charging them money for something they could
get for free, because they get confused otherwise. ( Larry Wall )