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to Python interpreter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.21 Customizing cross protection code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 i 3.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 13 The Security of PyArmor 101 13.1 Cross Protection for _pytransform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . scripts to Python interpreter. 3. Make sure the entry script is patched by cross protection code, and try to Customizing cross protection code 4. Use the corresponding Restrict Mode 8 Chapter 2. Using

Work with Cython Work with PyUpdater Binding obfuscated scripts to Python interpreter Customizing cross protection code Storing runtime file license.lic to any location Register multiple pyarmor in same Obfuscating module Mode Restrict Mode The Performance of Obfuscated Scripts The Security of PyArmor Cross Protection for _pytransform When Things Go Wrong Segment fault Bootstrap Problem Obfuscating Scripts the entry script is patched by cross protection code [https://pyarmor.readthedocs.io/en/latest/how-to-do.html#special-handling-of-entry-script], and try to Customizing cross protection code 4. Use the corresponding

Work with Cython Work with PyUpdater Binding obfuscated scripts to Python interpreter Customizing cross protection code Storing runtime file license.lic to any location Register multiple pyarmor in same Obfuscating module Mode Restrict Mode The Performance of Obfuscated Scripts The Security of PyArmor Cross Protection for _pytransform When Things Go Wrong Segment fault Bootstrap Problem Obfuscating Scripts the entry script is patched by cross protection code [https://pyarmor.readthedocs.io/en/latest/how-to-do.html#special-handling-of-entry-script], and try to Customizing cross protection code 4. Use the corresponding

to Python interpreter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.20 Customizing cross protection code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3.21 Storing . . . . . . 86 12 The Performance of Obfuscated Scripts 89 13 The Security of PyArmor 91 13.1 Cross Protection for _pytransform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . not required for Super Mode. 3. Make sure the entry script is patched by cross protection code, and try to Customizing cross protection code 4. Use the corresponding Restrict Mode 5. Use the high security

. . . . . . 69 12 The Performance of Obfuscated Scripts 73 13 The Security of PyArmor 75 13.1 Cross Protection for _pytransform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . option --no-cross-protection is specified, the obfuscated scripts will not check the dynamic library, so no platform is required. For example: pyarmor obfuscate --no-runtime --recursive --no-cross-protection --restrict 0 and --no-cross-protection should be set, otherwise the final C program could not work. For example, first obfus- tate the scripts: pyarmor obfuscate --restrict 0 --no-cross-protection foo.py

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 The Security of PyArmor 11 4.1 Cross Protection for _pytransform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . execution. So even trace code in any c debugger, only a piece of code object could be got one time. 4.1 Cross Protection for _pytransform The core functions of PyArmor are written by c in the dynamic library library _pytransform is checked in the obfuscated script to be sure it’s not changed. This is called Cross Protection. The dynamic library _pytransform.so uses JIT technical to achieve two tasks: • Keep

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 The Security of PyArmor 13 4.1 Cross Protection for _pytransform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . execution. So even trace code in any c debugger, only a piece of code object could be got one time. 4.1 Cross Protection for _pytransform The core functions of PyArmor are written by c in the dynamic library library _pytransform is checked in the obfuscated script to be sure it’s not changed. This is called Cross Protection. The dynamic library _pytransform.so uses JIT technical to achieve two tasks: • Keep