A PPF Patch Engine is a tool which is able to create (and apply) small patches by comparing the original & patches ISO CD-Image and extracting only the difference between them. It is very similar to the IPS Patcher which was created for patching SNES patches which I also used in my UniFIX patch engine (AMIGA) a few years back.
For a full explanation checkout the PPF Page at Paradogs.com.
MAC PPF Patcher 2.0 - PPF 1.0 & 2.0 - [51 KB] - MAC
Playstation Patch File Version 1.0 - PPF 1.0 - [43 KB]
PPF4Linux- [112 KB] - Linux
The PPF Patcher is a tool which is able to create (and apply) small patches by comparing the original & patches ISO image and extracting only the difference between them.
The AMIGA & PC version of the tools are included in the archive and the C source is also included to port it to other operating systems.