Emproof Nyx Python Protection is a code protection solution designed to secure Python3 source files against reverse engineering, disassembly, and decompilation. The tool addresses a core vulnerability of Python's interpreted nature: Python projects distributed as source files or compiled .pyc files (including those processed with Cython) remain susceptible to reverse engineering using widely available tools. Protection is delivered through two complementary mechanisms: **Python File Protection:** Rather than applying static obfuscation, the solution dynamically transforms the Python interpreter's instruction sets and assigns unique opcode mappings to every code object, including functions and lambdas. These mappings are further obfuscated to create a shifting target that resists pattern analysis and known-plaintext attacks. **Interpreter Protection:** The Python interpreter itself is modified and secured through integration with the broader Emproof Nyx platform. The modified interpreter can execute protected Python files while also remaining compatible with standard, unprotected Python3 modules and third-party libraries. Additional protections include string hiding, where all strings in the code are replaced with encoded versions decoded only at runtime, preventing sensitive data exposure in compiled files. The tool is designed to integrate as the final step in a CI/CD pipeline, requiring only source code files as input and producing a self-contained, ready-to-ship package with no additional runtime dependencies. It supports multiple hardware architectures including ARM Cortex-M, RISC-V, and x86.