: These are likely the title or "series" name of the video content. In this context, they usually refer to specific scenes produced by adult media companies.
: These terms refer to the video codec used. HEVC (High-Efficiency Video Coding), also known as x265, is a compression standard that allows for high-quality video at much smaller file sizes compared to the older AVC/x264 standard.
Below is an explanation of what each part of this technical string represents and why you should exercise caution if you encounter it online. Breakdown of the String