This is the studio name. Established in the early 2000s, 10musume became famous for its "natural" approach, often featuring performers in everyday settings with a focus on high-definition, one-on-one interactions.
Websites like JAVLibrary use these specific codes (090512_02) to help users find credit lists, original cover art, and filming dates. 10musume 090512 02 Sakura Miyazaki fayetsav
The keyword "10musume 090512 02 Sakura Miyazaki fayetsav" is a highly specific "digital fingerprint" for a piece of media from May 2009. It highlights the importance of in preserving and finding niche entertainment from the past decade. This is the studio name
To understand the content, you have to break down the metadata provided in the keyword: original cover art