The Electronic Frontier Foundation (EFF) filed a brief with the Supreme Court of the United States on Friday, arguing on behalf of 77 computer scientists that the justices should review an appellate court decision finding that application programming interfaces (APIs) are copyrightable. That decision, handed down by the U.S. Court of Appeals for the Federal Circuit in May, up-ended decades of settled legal precedent and industry practice.

Signatories to the brief include five Turing Award winners, four National Medal of Technology winners, and numerous fellows of the Association for Computing Machinery, IEEE, and the American Academy of Arts and Sciences. The list also includes designers of computer systems and programming languages such as AppleScript, AWK, C++, Haskell, IBM S/360, Java, JavaScript, Lotus 1-2-3, MS-DOS, Python, Scala, SmallTalk, TCP/IP, Unix, and Wiki.

"The Federal Circuit's decision was wrong and dangerous for technological innovation," EFF Intellectual Property Director Corynne McSherry said. "Excluding APIs from copyright protection has been essential to the development of modern computers and the Internet. The ruling is bad law, and bad policy."

APIs are specifications that allow programs to communicate with each other. So when you type a letter in a word processor, and hit the print command, you are using an API that lets the word processor talk to the printer driver, even though they were written by different people.

The brief explains that the freedom to re-implement and extend existing APIs has been the key to competition and progress in both hardware and software development. It made possible the emergence and success of many robust industries we now take for granted?for example, mainframes, PCs, and workstations/servers?by ensuring that competitors could challenge established players and advance the state of the art.

The litigation began several years ago when Oracle sued Google over its use of Java APIs in the Android OS. Google wrote its own implementation of the Java APIs, but, in order to allow developers to write their own programs for Android, Google's implementation used the same names, organization, and functionality as the Java APIs.

In May 2012, Judge William Alsup of the Northern District of California ruled that the Java APIs are not subject to copyright. The court understood that ruling otherwise would have allowed Oracle to tie up "a utilitarian and functional set of symbols" that provides the basis for so much of the innovation and collaboration we all rely on today. The Federal Circuit disagreed, holding that Java's API packages were copyrightable, although it sent the case back to the trial court to determine whether Google's copying was nonetheless a lawful fair use.