NWaaS: Nonintrusive Watermarking as a Service for X-to-Image DNN

• URL: http://arxiv.org/abs/2507.18036v1
• Date: Thu, 24 Jul 2025 02:07:28 GMT
• Title: NWaaS: Nonintrusive Watermarking as a Service for X-to-Image DNN
• Authors: Haonan An, Guang Hua, Yu Guo, Hangcheng Cao, Susanto Rahardja, Yuguang Fang,
• Abstract summary: Deep neural network (DNN) models can be protected with watermarking.<n>Current methods are inherently intrusive as they modify the model parameters or alter the structure.<n>We introduce Nondefined Watermarking as a Service (NW), a novel trustless paradigm designed for X-to-Image models.<n>NW addresses deployment challenges by establishing a robust and nonintrusive side channel in the protected model's black-box API.
• Score: 15.803288210824796
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The intellectual property of deep neural network (DNN) models can be protected with DNN watermarking, which embeds copyright watermarks into model parameters (white-box), model behavior (black-box), or model outputs (box-free), and the watermarks can be subsequently extracted to verify model ownership or detect model theft. Despite recent advances, these existing methods are inherently intrusive, as they either modify the model parameters or alter the structure. This natural intrusiveness raises concerns about watermarking-induced shifts in model behavior and the additional cost of fine-tuning, further exacerbated by the rapidly growing model size. As a result, model owners are often reluctant to adopt DNN watermarking in practice, which limits the development of practical Watermarking as a Service (WaaS) systems. To address this issue, we introduce Nonintrusive Watermarking as a Service (NWaaS), a novel trustless paradigm designed for X-to-Image models, in which we hypothesize that with the model untouched, an owner-defined watermark can still be extracted from model outputs. Building on this concept, we propose ShadowMark, a concrete implementation of NWaaS which addresses critical deployment challenges by establishing a robust and nonintrusive side channel in the protected model's black-box API, leveraging a key encoder and a watermark decoder. It is significantly distinctive from existing solutions by attaining the so-called absolute fidelity and being applicable to different DNN architectures, while being also robust against existing attacks, eliminating the fidelity-robustness trade-off. Extensive experiments on image-to-image, noise-to-image, noise-and-text-to-image, and text-to-image models, demonstrate the efficacy and practicality of ShadowMark for real-world deployment of nonintrusive DNN watermarking.

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