VNDB, under ODbL.

Every VN catalog record on Yumefumi — titles, dates, developers, tags, cover art metadata, route structures — originates from VNDB, maintained by volunteer effort for over twenty years.

VNDB catalog data is released under the Open Database License (ODbL) v1.0. Yumefumi uses that data under the same license, with attribution. This page is Yumefumi's ODbL attribution.

Under ODbL, derivative works must share alike — any structured catalog data exported from Yumefumi carries the same license. User-authored content on Yumefumi (reviews, lists, ratings, notes) is separate and is not covered by ODbL; it belongs to the user who wrote it.

If a specific catalog entry is incorrect, the authoritative place to fix it is on VNDB. Yumefumi syncs from VNDB periodically; once VNDB is corrected, the fix flows downstream.

Questions about catalog licensing or attribution can go to support@yumefumi.com.