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The paper addresses the problem of data laundering, where proprietary data is transformed to obfuscate its origin during LLM training, thus evading standard detection methods. They introduce Synthesis Data Reversion (SDR), a method that infers the laundering transformation and synthesizes queries mimicking the laundered data to re-establish detection signals. SDR identifies a high-level transformation goal and iteratively refines the details of the synthesized queries to maximize detection signals from the target LLM.
Data laundering can't hide forever: this new technique lets rights owners detect misuse of their content in LLMs, even when the data has been heavily transformed.
Data rights owners can detect unauthorized data use in large language model (LLM) training by querying with proprietary samples. Often, superior performance (e.g., higher confidence or lower loss) on a sample relative to the untrained data implies it was part of the training corpus, as LLMs tend to perform better on data they have seen during training. However, this detection becomes fragile under data laundering, a practice of transforming the stylistic form of proprietary data, while preserving critical information to obfuscate data provenance. When an LLM is trained exclusively on such laundered variants, it no longer performs better on originals, erasing the signals that standard detections rely on. We counter this by inferring the unknown laundering transformation from black-box access to the target LLM and, via an auxiliary LLM, synthesizing queries that mimic the laundered data, even if rights owners have only the originals. As the search space of finding true laundering transformations is infinite, we abstract such a process into a high-level transformation goal (e.g.,"lyrical rewriting") and concrete details (e.g.,"with vivid imagery"), and introduce synthesis data reversion (SDR) that instantiates this abstraction. SDR first identifies the most probable goal for synthesis to narrow the search; it then iteratively refines details so that synthesized queries gradually elicit stronger detection signals from the target LLM. Evaluated on the MIMIR benchmark against diverse laundering practices and target LLM families (Pythia, Llama2, and Falcon), SDR consistently strengthens data misuse detection, providing a practical countermeasure to data laundering.
