District Court for the Northern District of California
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Fair use or foul play? The AI fair use copyright line

The US District Court for the Northern District of California granted summary judgment in favor of an artificial intelligence (AI) company, finding that its use of lawfully acquired copyrighted materials for training and its digitization of acquired print works fell within the bounds of fair use. However, the district court explicitly rejected the AI company’s attempt to invoke fair use as a defense to rely on pirated copies of copyrighted works as lawful training data. Andrea Bartz, et al. v. Anthropic PBC, Case No. 24-CV-05417-WHA (N.D. Cal. June 23, 2025) (Alsup, J.)

Anthropic, an AI company, acquired more than seven million copyrighted books without authorization by downloading them from pirate websites. It also lawfully purchased print books, removed their bindings, scanned each page, and stored them in digitized, searchable files. The goal was twofold:

  • To create a central digital library intended, in Anthropic’s words, to contain “all the books in the world” and to be preserved indefinitely.
  • To use this library to train the large language models (LLMs) that power Anthropic’s AI assistant, Claude.

Each work selected for training the LLM was copied through four main stages:

  • Each selected book was copied from the library to create a working copy for training.
  • Each book was “cleaned” by removing low-value or repetitive content (e.g., footers).
  • Cleaned books were converted into “tokenized” versions by being simplified and split into short character sequences, then translated into numerical tokens using Anthropic’s custom dictionary. These tokens were repeatedly used in training, allowing the model to discover statistical relationships across massive text data.
  • Each fully trained LLM itself retained “compressed” copies of the books.

Once the LLM was trained, it did not output any of the books through Claude to the public. The company placed particular value on books with well-curated facts, structured analyses, and compelling narratives (i.e., works that reflected well-written creative expressions) because Claude’s users expected clear, accurate, and well-written responses to their questions.

Andrea Bartz, along with two other authors whose books were copied from pirated and purchased sources and used to train Claude, sued Anthropic for copyright infringement. In response, Anthropic filed an early motion for summary judgment on fair use only under Section 107 of the Copyright Act.

To assess the applicability of the fair use defense, the court separated and analyzed Anthropic’s actions across three distinct categories of use.

Transformative training (fair use)

The authors challenged only the inputs used to train the LLMs, not their outputs. The district court found that Anthropic’s use of copyrighted books to train its LLMs was a transformative use, comparable to how humans read and learn from texts and produce new, original writing. While the authors claimed that the LLMs memorized their creative expression, there was no evidence that Claude released infringing material to the public. The court concluded that using the works as training inputs – not for direct replication, but to enable the generation of new content – favored a finding of fair use.

Format-shifting copies (fair use)

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Venue Manipulation Obviates Geographically Bounded Claims in Venue Analysis

The US Court of Appeals for the Federal Circuit issued a rare grant of two mandamus petitions directing the US District Court for the Western District of Texas to transfer the underlying patent infringement actions to the US District Court for the Northern District of California pursuant to 28 U.S.C. § 1404(a). In re: Samsung Elecs. Co., Ltd., Case Nos. 21-139, -140 (Fed. Cir. June 30, 2021) (Dyk, J.)

Ikorongo Technology owned four patents directed to functionalities allegedly performed by applications run on the accused mobile products sold by Samsung and LG. Ikorongo Technology assigned to Ikorongo Texas—an entity formed only weeks before—exclusive rights to sue for infringement of those patents within specified parts of the state of Texas, including certain counties in the Western District of Texas, while retaining the rights to the patents in the rest of the United States.

Ten days later, Ikorongo Texas sued Samsung and LG in the Western District of Texas. Although Ikorongo Texas claimed to be unrelated to Ikorongo Technology, the operative complaints indicated that the same five individuals owned both Ikorongo Texas and Ikorongo Technology, and that both entities shared office space in North Carolina.

The day after filing the initial complaints, Ikorongo Texas and Ikorongo Technology filed first amended complaints, this time naming both Ikorongo Technology and Ikorongo Texas as co-plaintiffs, noting that together Ikorongo Texas and Ikorongo Technology owned the entire right, title and interest in the asserted patents, including the right to sue for past, present and future damages throughout the United States and the world.

Samsung and LG separately moved under 28 U.S.C. § 1404(a) to transfer the suits to the Northern District of California, arguing that “three of the five accused third-party applications were developed in Northern California, where those third parties conduct significant business activities and no application was developed or researched in Western Texas.” Samsung and LG also argued that potential witnesses and sources of proof were located in the Northern District of California.

The district court first concluded that Samsung and LG failed to establish § 1404(a)’s threshold requirement that the complaints “might have been brought” in the Northern District of California. Because Ikorongo Texas’s rights under the asserted patents were limited to the state of Texas and could not have been infringed in the Northern District of California, the district court held that venue over the entirety of the actions was improper under § 1400(b), which governs venue in patent infringement cases. Alternatively, the district court analyzed the traditional public- and private-interest factors, finding that defendants had not met their burden to show cause for transfer. Samsung filed for mandamus to the Federal Circuit.

The Federal Circuit found that the district court erroneously disregarded Ikorongo Technology and Ikorongo Texas’s attempts to manipulate venue when analyzing venue under § 1404(b). While no act of infringement of Ikorongo Texas’s geographically bounded rights took place in the Northern District of California, the Federal Circuit determined that “the presence of Ikorongo Texas is plainly recent, ephemeral, and [...]

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