nonPDROM refers to a type of ROM that doesn't require a proprietary software wrapper (PS Vita's PDROM) to run.

ROMs can be a great way to experience classic games or play games on devices that aren't officially supported. However, be aware of the potential copyright implications of downloading ROMs.

If you're interested in trying out this ROM, make sure to do your research and only download from trusted sources."

It seems like you're searching for a ROM of Street Fighter X Tekken on the PS Vita, specifically a nonPDROM version.

A ROM (Read-Only Memory) is a copy of a game or software that is extracted from a console or device and can be played on other devices using an emulator.