You can upload (read) the program without a password, but you need one to download or modify.
: Specifically locks individual program blocks (POUs) so that the underlying logic cannot be viewed or edited even if you have access to the rest of the project. As noted in Siemens Support Documentation , removing this protection typically requires the original password to be entered within the "Edit" menu. Common Reasons for Password Retrieval siemens s7 200 smart password unlock link