Each company reacted a bit differently:
- HP claims there are no grounds for the suit and that it is a disupute about IBM
- Red Hat claims there is no infringement
- Sun claims they have paid a large amount of money for their licenses a long time ago and thus Solaris is fine
- And Microsoft, as we know from yesterday, licensed the code in order to "support intellectual property rights" (in other words, to help SCO fund the fight against Linux).