Earlier this year, OPPO filed a lawsuit with the Shanghai Intellectual Property Court, alleging that ASUS infringed upon one of its Chinese invention patents titled “A Method for Determining Prediction Values, Encoder, Decoder, and Computer Storage Medium” (Patent No.: CN202110412164.5). This patent forms part of OPPO's VVC standard essential patent (SEP) portfolio, which encompasses over 100 patent families. The case is understood to be the world's first dispute involving VVC (Versatile Video Coding) standard essential patents. In response, ASUS filed a request with China's National Intellectual Property Administration in September seeking invalidation of the aforementioned patent.

VVC, fully known as Versatile Video Coding and designated internationally as H.266, is the next-generation video compression standard succeeding the widely used HEVC/H.265. Jointly developed by the International Organization for Standardization, it aims to reduce video file sizes by approximately 50% while maintaining equivalent or superior image quality. According to the HEVC/VVC report released by the China Academy of Information and Communications Technology (CAICT), OPPO ranks 14th globally in patent families.

The litigation dispute between the parties originated earlier in the telecommunications sector. In April 2025, ASUS and Creative Sonic filed multiple patent infringement lawsuits against OPPO and its premium brand OnePlus in the Munich Regional Court, Germany. The involved patent, EP2802185 (Method and Apparatus for Adding Service Cells in a Wireless Communication System), constitutes a core foundational patent in mobile communications.

In June 2025, ASUS filed a lawsuit against OPPO and its subsidiary Realme at the Munich division of the Unified Patent Court (UPC), targeting patent EP3346616 titled “Method and Apparatus for Beam Management in a Wireless Communication System.” Subsequently, Celerity IP initiated another patent lawsuit against Xiaomi and OPPO at the UPC. The litigation primarily revolves around standard-essential patents (SEPs) related to wireless communication technology held by ASUS and Celerity IP.

In response to ASUS's series of lawsuits, OPPO filed a counterclaim with the Ningbo Intermediate People's Court in Zhejiang Province, alleging infringement of multiple Chinese invention patents. According to Tianyancha data, the case commenced trial proceedings on December 15.