Those companies, which include Linux firms, use a special "free software" license called the General Public License that
bars any payment.
Well last time I looked the FSF actually encorages you to sell GPL software http://www.fsf.org/philosophy/selling.html. Of course the person you sell it to can give it to his mates, stick it on the web without payment.
Open Source Software (OSS) is software whose source code is openly published, is often developed by voluntary efforts and is usually available at no charge under a licence defined by the Open Source Initiative which prevents it from being redistributed under a more restrictive licence
So they are describing the GPL licence but calling it "Open". Hope they don't meet Richard Stallman on a dark night.
I would imagine doing a rm -fR / might not go down too well, even with the backups
I don't understand how they where DoSed, I can't find a /. story posted over the weekend with a link to RIAA.