Challenge: Existing methods to trace the usage of large language models often face trade-offs between imperceptibility and robustness.
Approach: They propose a key-centered scheme to unify existing methods by decomposing a watermark into two components: a 'key module' and a "mark module".
Outcome: The proposed method can be integrated with existing methods and achieve near-optimal imperceptibility and detection efficacy.

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From Trade-off to Synergy: A Versatile Symbiotic Watermarking Framework for Large Language Models (2025.acl-long)

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Challenge: Existing watermarking methods face limitations that hinder their effectiveness in diverse and adversarial scenarios.
Approach: They propose a symbiotic watermarking framework with three strategies: serial, parallel, and hybrid.
Outcome: The proposed framework outperforms baselines and achieves state-of-the-art (SOTA) performance.
Subtle Signatures, Strong Shields: Advancing Robust and Imperceptible Watermarking in Large Language Models (2024.findings-acl)

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Challenge: Large Language Models (LLMs) have led to an increase in AI-generated text on the Internet, presenting a crucial challenge to differentiate AI-created content from human-written text.
Approach: They propose a novel approach to embed watermarks into LLMs that leverages token prior probabilities to improve detectability and maintain watermark imperceptibility.
Outcome: The proposed method improves detectability and imperceptibility of watermarks by partitioning tokens into two distinct groups based on prior probabilities and employing tailored strategies for each group.
WaterBench: Towards Holistic Evaluation of Watermarks for Large Language Models (2024.acl-long)

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Challenge: Recent studies have developed watermarking algorithms which restrict the generation process to leave an invisible trace for watermark detection.
Approach: They propose a benchmarking procedure that compares different methods to ensure consistent watermarking strength and jointly evaluates their generation and detection performance.
Outcome: The proposed benchmark compares 4 open-source watermarks on 2 LLMs under 2 watermarking strengths and observes the common struggles for current methods on maintaining the generation quality.
Watermarking Large Language Models: An Unbiased and Low-risk Method (2025.acl-long)

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Challenge: Recent advances in large language models (LLMs) have highlighted the risk of misusing them, raising the need for accurate detection of LLM-generated content.
Approach: They propose a method to inject imperceptible identifiers into large language models (LLMs) this method is unbiased and preserves the original token distribution in expectation .
Outcome: The proposed method preserves the original token distribution in expectation and has lower risk of producing unsatisfactory outputs in low-entropy scenarios compared to existing unbiased watermarks.
From Intentions to Techniques: A Comprehensive Taxonomy and Challenges in Text Watermarking for Large Language Models (2025.findings-naacl)

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Challenge: Large Language Models (LLMs) are rapidly growing and allowing textual content to be protected against unauthorized use.
Approach: They present a unified overview of different perspectives behind designing watermarking techniques through a comprehensive survey of the research literature.
Outcome: The proposed methods are based on the evaluation datasets used and watermarking addition and removal methods to construct a taxonomy.
Watermark under Fire: A Robustness Evaluation of LLM Watermarking (2025.findings-emnlp)

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Challenge: Various watermarking methods have been proposed to identify LLM-generated texts . lack of unified evaluation platforms has left many critical questions unanswered .
Approach: They systematize existing LLM watermarkers and watermark removal attacks and develop a unified platform that integrates them.
Outcome: The proposed systematizes existing LLM watermarkers and watermark removal attacks, mapping out their design spaces.
PostMark: A Robust Blackbox Watermark for Large Language Models (2024.emnlp-main)

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Challenge: Existing methods to detect LLM-generated text require access to the underlying LLM’s logits, which LLM providers are loath to share due to fears of model distillation.
Approach: They develop a post-hoc watermarking procedure that inserts an input-dependent set of words into the text after the decoding process has completed.
Outcome: The proposed method is more robust to paraphrasing attacks than existing methods.
WaterJudge: Quality-Detection Trade-off when Watermarking Large Language Models (2024.findings-naacl)

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Challenge: Recent work has shown that small, context-dependent shifts in word distributions can be used to apply and detect watermarks, but little work has analyzed the impact of these perturbations on the quality of generated texts.
Approach: They propose a framework that allows for analysis of the impact of watermark settings on the quality of generated texts.
Outcome: The proposed framework provides easy visualization of the quality-detection trade-off of watermark settings.
WatME: Towards Lossless Watermarking Through Lexical Redundancy (2024.acl-long)

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Challenge: Existing methods for text watermarking rely on arbitrary vocabulary partitioning during decoding, which compromises the availability of suitable tokens and significantly degrades the quality of responses.
Approach: They propose a method that leverages linguistic prior knowledge of lexical redundancies in LLM vocabularies to seamlessly integrate watermarks.
Outcome: The proposed approach preserves the expressive power of large language models while preserving watermark detectability.
A Robust Semantics-based Watermark for Large Language Model against Paraphrasing (2024.findings-naacl)

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Challenge: Existing methods to detect LLM-generated content use simple hashes of precedent tokens to partition vocabulary.
Approach: They propose a semantics-based watermark framework to enhance the robustness against paraphrase.
Outcome: The proposed framework is robust under different paraphrases and the semantic meaning of the sentences will be likely preserved under paraphrase.

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