This, as I understand, is a Verilog implementation of a PowerPC instruction compatible set "soft core", for use in FPGA or ASIC chip design, provided in open-source form under the GPL Version 2 license. (No "or later version" is listed, so it is Version 2 only.)
This source code is imported from the _Pippo-0.9.zip archive found at https://groups.yahoo.com/neo/groups/openzcore/files
It sounds like Pippo was the name of their prototyping board
The English document translation was made by https://www.onlinedoctranslator.com/translate-chinese-(simplified)-to-english_zh-CN_en making use of Google Translate
The YahooGroups downloads page also has a [gibberish].exe executable file. As no source code for that is known to be publically available, I have de-added it to this repository. Beware of unknown *.exe files anyway, right?