The file opens fine, but you can't print or edit it. QPDF removes this in seconds.
You can't even see the first page without a password. You will need to provide the password to a tool like PikePDF to save a decrypted copy, or use Hashcat to "crack" it if forgotten. Security Warning pdf password remove github top
Before choosing a tool from GitHub, you need to know what you're fighting: The file opens fine, but you can't print or edit it