The compression efficiency of HEVC is a key factor in its widespread adoption for video piracy. By reducing the file size of video content, HEVC enables pirates to distribute high-quality video at a lower cost and with greater ease. Specifically, HEVC achieves a reduction in bitrate of around 50% compared to H.264/AVC for similar video quality. This reduction in file size makes it easier for pirates to share and distribute copyrighted content, as it requires less storage space and bandwidth.