Twitter was granted a patent on "pull down to refresh". Patent law is a different areas of intellectual property law from copyright. The songwriting case is a

Twitter was granted a patent on "pull down to refresh". Patent law is a different areas of intellectual property law from copyright. The songwriting case is a copyright case. The analogy for Twitter would be copying source code, but not with full fidelity. If it's not "obviously wrong" that's because it's not verbatim; it's up to the court to decide whether there is enough similarity between the two for infringement to have occurred.