I believe a similar question was asked on Slashdot a while back. Someone had some GPLv2 code that another company was selling. The general response was that it

I believe a similar question was asked on Slashdot a while back. Someone had some GPLv2 code that another company was selling. The general response was that it was completely legal, because the company only had to disclose the source code to people who bought the product. Source had to be made available, but it's not so strict as to "publicly available." I'm not a lawyer so I'd go with one of the links posted for software legal advice.