And remember that Fair Use is a four-part balancing test. Thus, a single factor shifting will still have to be weighed against the rest. Also, for the S3 APIs,

And remember that Fair Use is a four-part balancing test. Thus, a single factor shifting will still have to be weighed against the rest. Also, for the S3 APIs, you're also talking about using even _less_ of Amazon's copyrighted code (e.g. a dozen function signatures compared to millions of LoC).