Julie Samuels of advocacy group Electronic Frontier Foundation has argued that a finding that APIs can be copyrighted (as distinct from the code used to implement a particular API), it will "have a profound negative impact on interoperability, and, therefore, innovation".
Samuels argued: "APIs are ubiquitous and fundamental to all kinds of program development. It is safe to say that all software developers use APIs to make their software work with other software. For example, the developers of an application like Firefox use APIs to make their application work with various OSes by asking the OS to do things like make network connections, open files, and display windows on the screen. Allowing a party to assert control over APIs means that a party can determine who can make compatible and interoperable software, an idea that is anathema to those who create the software we rely on everyday."