Capcom, Square Enix, Namco Bandai and Square Enix are all notable absent from the PlayStation Vita UMD Passport scheme, which allows players to download discounted digital versions of games they already own on UMD.
Siliconera pointed out the absentees, but reported that around 262 games will be available under the Japanese scheme, from publishers like Atlus, Nippon Ichi, and Tecmo Koei.
Capcom's Monster Hunter title is one of PSP's biggest franchises, with Monster Hunter Portbale 3rd for PSP selling 2.58 million units in Japan in just two weeks, making it the fastest selling game in Capcom's history.
In June this year sales for the title were at 4.7 million units.
UMD Passport is so far only announced for Japan, where the PlayStation Vita will launch December 17.