Adobe (ADBE) Stock: Gains 1.9% Despite Proposed Class Action Over AI Training

TLDRs;

• Adobe stock rose 1.9% even as authors sue over alleged AI training copyright misuse.
• The lawsuit claims SlimLM models were trained using unauthorized copies of copyrighted books.
• Using open-source datasets with copyrighted works exposes AI companies to legal and financial risk.
• Licensed dataset vendors and provenance tools could see rising demand amid AI copyright concerns.

Adobe Inc. (NASDAQ: ADBE) saw its stock rise by nearly 1.9% on Wednesday, even as the company faces a proposed class action lawsuit in the United States over alleged misuse of copyrighted works in AI training.

Adobe Inc., ADBE

The legal action, filed in California federal court on December 17, 2025, highlights growing scrutiny over how tech companies source and use content for artificial intelligence development.

Authors Challenge AI Training Practices

The lawsuit was initiated by author Elizabeth Lyon, who claims that Adobe used unauthorized copies of her instructional books, along with works from other authors, to train its SlimLM small language models.

These AI models are designed to assist with document-related tasks on mobile devices. Lyon is seeking unspecified monetary damages on behalf of herself and other affected authors.

While this is the first case directly targeting Adobe, it comes amid a wave of similar lawsuits against major tech firms, including OpenAI and Anthropic, over alleged copyright violations during AI model training. These cases collectively raise questions about legal accountability in the rapidly evolving AI landscape.

Data Lineage Under Scrutiny

Adobe’s SlimLM model was trained using the SlimPajama-627B dataset, which is reportedly derived from RedPajama, an open-source dataset that includes Books3, a collection of approximately 191,000 titles that has been subject to prior copyright disputes.

Despite Adobe’s assurances that it primarily relies on licensed, public-domain, and Adobe Stock content for its AI models, the use of datasets containing potentially unauthorized works exposes the company to legal risk.The lawsuit underscores a broader issue for AI developers: using so-called “open-source” datasets can inadvertently introduce copyrighted material, raising liability questions.

Courts will now have to determine how responsibility should be assigned along the data supply chain, particularly whether downstream companies that train AI models on third-party datasets can be held accountable for unauthorized works included by the original compilers.

Market Reaction and Investment Implications

Despite the legal headwinds, Adobe’s stock gained on the day, suggesting investor confidence in the company’s long-term growth prospects. Analysts note that while the lawsuit could lead to potential financial liability, Adobe’s extensive portfolio of creative and enterprise software products continues to perform strongly.

The case also points to a growing market opportunity for vendors that provide fully licensed datasets or tools to track data provenance. Companies like SyndiGate, which offer datasets cleared for AI training, could benefit from heightened demand as enterprise AI teams seek to mitigate copyright risks.

Investors may also monitor providers of compliance and licensing verification tools, as businesses look to ensure their AI models are built on legally sound content.

Looking Ahead: Legal and Industry Implications

As AI adoption expands across industries, legal frameworks are struggling to keep pace. This lawsuit against Adobe may set an important precedent for how courts assign liability in AI training and could influence how companies source data moving forward.

Enterprises may increasingly prioritize datasets with clear licensing, and publishers could continue negotiating rights agreements with AI developers, shaping the economics of the AI content ecosystem.

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