Avatars allow users to feel as though they are extensions of their own bodies, creating an immersive experience that blurs the line between virtual and real compared to other virtual communities. On the other hand, the avatar faces serious security and privacy problems, especially when people and the law/regulation are increasingly less tolerant of security and privacy, such as copyright, false identity detection, dataset security, authentication, and content tampering. This special issue collects 15 papers reporting the recent developments of security and privacy of avatar in metaverse.

For the Avatar Copyright Protection. "A Self-Defense Copyright Protection Scheme for NFT Image Art Based on Information Embedding" addresses copyright issues related to avatars produced in the Metaverse and proposes a copyright protection scheme that not only enables tracking and verification of avatar content transactions but also validates the legality of the source and ownership of the avatar content.

"Invisible Adversarial Watermarking: A Novel Security Mechanism for Enhancing Copyright Protection" addresses the potential for unauthorized access and use of image datasets used to generate avatars and proposes an image protection method that combines adversarial perturbations with invisible watermarks. This approach not only prevents illegal use of the image datasets but also enables effective tracking of data copyright.

In "FaceDefend: Copyright Protection to Prevent Face Embezzle, " the authors propose a solution to the misuse problem arising from the theft of real facial image data used in avatar generation, based on defensive strategies. This approach effectively ensures copyright protection for real facial data.

For the False Identity Detection for Avatars.

The authors of "Audio-Visual Contrastive Pre-train for Face Forgery Detection" address the issue of potential facial privacy breaches due to the realism of avatars in virtual worlds, which can lead.