The Linux Kernel is one of the most fascinating bits of software out there, partially owing to the vast number of contributors who are responsible for creating it. The Kernel has spread into many areas of our lives; it is used extensively in embedded devices (where its presence goes largely unnoticed) and it is ubiquitous in servers. Its growing success in servers comes at the expense of other established software companies.
With the growth of Linux comes great fear among its rivals. Contributors and proponents of Linux are motivated by the fact that Linux is Free software. Ownership is such that the user truly owns the software, rather than essentially 'renting' it by paying a license for use. This makes Linux a very disruptive technology.
SCO Makes an Appearance
The development methodology of Linux, its cost, and that question of ownership can also be used as an argument against it, especially by fierce opponents whose territory is being encroached upon by this mighty kernel. This has truly been the case ever since SCO chose to take a litigious route to combating Linux.
SCO asserted that Linux developers had stolen SCO's code. For several years a legal battle persisted which ended up with SCO filing for bankruptcy. After over four years, SCO is still unable to prove its claims, which it was never willing to back in an upfront fashion.