What can Discriminator do? Towards Box-free Ownership Verification of Generative Adversarial Networks - Huang, Ziheng; Li, Boheng; Cai, Yan; Wang, Run; Guo, Shangwei; Fang, Liming; Chen, Jing; Wang, Lina (2023 IEEE/CVF International Conference on Computer Vision (ICCV), Computer Vision (ICCV), 2023 IEEE/CVF International Conference on, ICCV, 2023)