Who should be directly liable for online infringement – the entity that serves it up or a user who embeds a link to it? For almost two decades, most U.S. courts have held that the former is responsible, applying a rule called the server test. Under the server test, whomever controls the server that hosts a copyrighted work—and therefore determines who has access to what and how—can be directly liable if that content turns out to be infringing. Anyone else who merely links to it can be secondarily liable in some circumstances (for example, if that third party promotes the infringement), but isn’t on the hook under most circumstances.

The test just makes sense. In the analog world, a person is free to tell others where they may view a third party’s display of a copyrighted work, without being directly liable for infringement if that display turns out to be unlawful. The server test is the straightforward application of the same principle in the online context. A user that links to a picture, video, or article isn’t in charge of transmitting that content to the world, nor are they in a good position to know whether that content violates copyright. In fact, the user doesn’t even control what’s located on the other end of the link—the person that controls the server can change what’s on it at any time, such as swapping in different images, re-editing a video or rewriting an article.

But a news publisher, Emmerich Newspapers, wants the Fifth Circuit to reject the server test, arguing that the entity that embeds links to the content is responsible for “displaying” it and, therefore, can be directly liable if the content turns out to be infringing. If they are right, the common act of embedding is a legally fraught activity and a trap for the unwary.

Suing your readers always ends well.