How to know the machine code of the user's computer?

When a user wants to play an encrypted file, the encrypted file will pop up a dialog box to request the user to enter a Playback Password. This dialog box will display the machine code of the user's computer. The user can send his/her own machine code to you, and you can create a Playback Password based on the user's machine code. After that the user can use this Playback Password to play your file on his/her computer.

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