The Korea Electronics and Telecommunications Research Institute (ETRI) has filed a lawsuit against Transsion and several of its affiliated companies at the UPC Düsseldorf Division for infringement of HEVC/H.265 patents. The court officially accepted the case on July 14, 2025 (case number: ACT_32800/2025).

The patent in question is EP3258692 (Method and Apparatus for Predicting Motion Vectors). According to the patent list published by the HEVC Advance patent pool, this patent has corresponding patent deployments in multiple countries, including China, France, and Belgium.

Transsion recently reached a settlement agreement with Philips (AAC/USAC patents) and signed licensing agreements with ViaLA, Qualcomm, and Nokia. However, it faces multiple challenges in the HEVC field: ETRI has become the fifth licensor to sue Transsion for HEVC infringement at the UPC, following Huawei, NEC, JVC Kenwood, and Sun Patent Trust; unresolved HEVC patent litigation also exists in emerging markets such as Brazil.