Siemens S7-1200 System Manual page 194

Programming concepts
6.6 Protection
Use the "Properties" task card of the code block to configure the know-how protection for
that block. After opening the code block, select "Protection" from Properties.
1. In the Properties for the code block, click
the "Protection" button to display the
"Know-how protection" dialog.
2. Click the "Define" button to enter the
password.
After entering and confirming the password,
click "OK".
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S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG