It depends. If the schematic is under CERN OHL 1.2, you can sell it but must provide your own schematic source files. If it’s CC BY-NC, you cannot sell without permission.
Use a free schematic, export Gerbers, and order 5 pieces from JLCPCB (their standard FR-4 is 94V-0). Cost: ~$10 for 5 boards plus shipping. cm4 94v0 schematics free
Remember: always verify the license, double-check the power sequencing, and instruct your PCB fab to use . With these precautions, a free schematic becomes the blueprint for a reliable, safe, and powerful Compute Module 4 project. It depends