FAQ (Frequently Asked Questions) » 18. When I sign e-documents I receive a message “Your certificate is not valid for signing”, “Invalid signature” or other error message
It is possible that your browser does not allow to install the Microsoft's component capicom.dll. To allow it, follow the instruction:
About Internet Explorer 9 or newer versions, after opening "Tools" menu and choosing "Manage add-ons...", find and mark in the list "Settings Class" and click "Enable" button:
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