Recent patent court decisions and also rules of patent practice issued by the US Patent and Trademark Office (PTO) are changing how the wide spectrum of entities that use computers to conduct fiscal businesses will operate them in the United States, because they now can obtain and assert reliable patent rights against competitors. This legal landscape is evolving from court decisions spanning more than 20 years that define a patent-based framework within which computer technology in particular, computer software can be protected. Software owners have sought such protection because of: (a) recognized limitations in copyrights which protect expression (ie literal lines of computer code), but not ideas (ie the constructs software implement); (b) the substantial financial value software gained during the same decades; and (c) the continuing growth of the businesses that are dependent on computers. It is estimated that by 2001 Internet commerce in the United States will be worth $200 billion. Initially patent protection was not sought for software because of the amount of time involved in obtaining patent rights and also the fact that the Supreme Court (the US court of last resort) has consistently held that laws of nature, natural phenomena, and abstract ideas are unpatentable subject matter. Software owners perceived tremendous commercial benefits from patent rights, and these perceptions sustained efforts to seek enforceable frameworks for obtaining reliable patent rights.