Kodak Portfolio CDs: Interactive menu using content from Audio CD and Photo CD tracks on one disk (real photo CD format, not the jpg Picture CD). (these are not to be confused with putting your portfolio on a CD.
Portfolio CD format never took off (I have a Kodak demo) as the tools to author were far too expensive. Even Photo CD was never popular due high cost of Kodak tools and closed specification.
A few dedicated CD audio/Photo CD players and free windows program can play Portfolio CDs. Basically menus with slide shows that have synchronised CD Audio sound track, but quite complex interactivity with cursor and hot spots. Obviously "portfolio" is proprietary Kodak format that is derived from Red Book (CD Audio) and Beige Book (Photo CD). But I've never heard of a Rainbow book for it.
Wikipedia knows nothing of Portfolio CDs.
1984 publicly announced in 1986
DVD menus are pretty much based on "portfolio CD" and CDi.
Appropriate Icon for these kind of "IP holders".