The Internet Archive has filed an appeal in the copyright infringement case, which it lost in the spring of this year, writes The Verge.

This is a landmark copyright infringement case initiated by major publishing houses Hachette, HarperCollins, Wiley & Sons, and Penguin Random House. They sued the Internet Archive for launching a program called the National Emergency Library.

The initiative has expanded another long-running program, the Open Library, which allows people to “borrow” scanned copies of physical books.

Publishers dubbed both systems “deliberate digital piracy on an industrial scale.” In the spring, the court largely agreed with them in its decision.

At the time, the Internet Archive promised to appeal and eventually kept its word. However, they admit that there is a tough fight ahead.

“As we stated when the decision was handed down in March, we believe the lower court made errors in facts and law, so we are fighting on in the face of great challenges,” said Freeland in the Archive’s announcement. “We know this won’t be easy, but it’s a necessary fight if we want library collections to survive in the digital age.”

The Internet Archive promises to share details about the case as it progresses.