In the context of digital PDF copies of this book, "patched" typically refers to of unauthorized scans. Because the original printings by Japan Publications are often out of print and highly valuable (sometimes retailing for over $200), digital versions circulated online frequently undergo "patching" to:
Assuming you refer to the well-known series by (published by Dragon Associates or similar distributors in the 1980s–1990s), Volume 2 typically covers: traditional karatedo okinawa goju ryu vol 2 pdf patched