7 Things You Might Be Doing Online That Could Get You Arrested By Lisa Rein for TakePart.com                                                                              June 2, 2014

From the article:

For instance, in Swartz’s case, his “crime” was having a script download the journal articles rather than sitting there and downloading them one at a time himself. Yet it’s not clear that such automation even violates MIT and JSTOR’s terms of service. As computer expert Alex Stamos describes it: “[Aaron] was an intelligent young man who found a loophole that would allow him to download a lot of documents quickly. This loophole was created intentionally by MIT and JSTOR, and was codified contractually” in documents revealed during the discovery phase of the government’s case against Swartz.

This vaguely defined law with strict penalties means that an overly ambitious prosecutor can imprison someone for doing things most Internet users consider routine, allowing law enforcement to go after people for violating a contract, even when the violated party isn’t encouraging prosecution.