WARDEN: Multi-Directional Backdoor Watermarks for Embedding-as-a-Service Copyright Protection Anudeex Shetty author Yue Teng author Ke He author Qiongkai Xu author 2024-08 text Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Lun-Wei Ku editor Andre Martins editor Vivek Srikumar editor Association for Computational Linguistics Bangkok, Thailand conference publication shetty-etal-2024-warden 10.18653/v1/2024.acl-long.725 https://aclanthology.org/2024.acl-long.725/ 2024-08 13430 13444