Simatic S7 Can Opener V1.31 33 -

It cannot unprotect SFC (System Function) or SFB (System Function Block) modules, as these reside in the PLC's internal memory and do not contain user-accessible code. Compliance and Best Practices

The software is typically licensed to the legal owner of the PLC blocks. Users are encouraged to use it strictly for recovery or maintenance purposes and should ensure they are operating within the Siemens industrial security guidelines to protect their plant's infrastructure. PLC programming with SIMATIC STEP 7 - TIA Portal - Siemens Simatic S7 Can Opener V1.31 33

It removes the "KNOW_HOW_PROTECT" keyword from compiled blocks, allowing users to view the underlying code. It cannot unprotect SFC (System Function) or SFB