“Open source operating systems such as Linux and Apache, which can generally be downloaded from the internet and adapted or modified for use with other programs, have become a mainstream business tool. More than half the world’s websites now run on the Apache web server and 57 per cent of companies polled by IDC, the research company, used Linux to run a big application within their enterprise. The popular view is that there are few restrictions on how open software can be used. But, like proprietary software, it is distributed with a copyright licence. While this may simply require anyone redistributing the software to acknow-ledge the original author, the most commonly used licence, the GNU General Public Licence or GPL, is significantly restrictive.” Read the rest of the article at Financial Times Online.