Plains Cotton Co-op Assoc. Ruled that only literal coping of code was infringement. Reasonable interpretation lies between two decisions. First, identify purpose of program, remove parts in public domain. Then compare the remaining parts of two programs to see how similar they are.
Issue is whether look and feel can be copyrighted.
Rulings inconsistent Main argument in favor of protecting a user interface is that it is a major creative effort. Other side, social benefits. Increase productivity of users and programmers. Development costs for new programs can be reduced.