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When using Multimedia Protector encrypted PDF files, it uses a built-in password to open the PDF file.
We know, PDF, once set to open password protected, is the most secure methods of protection.
Although you can steal out the temporary extracted PDF, but does not know the built-in password in Multimedia Protector, still unable to open it.
In short, this PDF if it is safe, depending on level of Multimedia Protector's own encryption.
The experienced cracker maybe can find the built-in password,hehe.