The latter half of the keyword refers to the technical processing of the file:

Used as titles on tube sites to help users find specific high-quality versions.

Keywords like "PPPD-896-engsub convert01-58-38 Min" are commonly found on:

The inclusion of indicates that this specific version of the media has been "English Subtitled." JAV productions are natively filmed in Japanese. For the international market, fans or third-party distributors often hardcode or provide soft-coded English translations. This allows viewers who do not speak Japanese to follow the dialogue and narrative context of the video. 3. "Convert01-58-38 Min" – Technical Specifications

The first part of the keyword, , is a standardized product code. In the Japanese media industry, these codes (often called "Content IDs") are used to identify specific releases from various studios.

Used by collectors to catalog specific versions of an actress's work.