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Mathematica stores its license information, consisting of the machine name, Machine ID, activation key and password, in a text file named “mathpass”.

You may need to locate your mathpass file in order to reset your Mathematica license by hand or look up any of the above licensing details.

Looking Up Licensing Information from Within Mathematica

Evaluate FilePrint[$PasswordFile] to obtain the content of the mathpass file that this instance of Mathematica is referencing.

Where to Find the Mathpass File

In your respective operating system, please open your mathpass file using a basic text editor.

Windows

The mathpass file is at one of the three following locations:

• C:\ProgramData\Mathematica\Licensing\mathpass
• C:\Users\<user>\AppData\Roaming\Mathematica\Licensing\mathpass
• C:\Program Files\Wolfram Research\Mathematica\Configuration\Licensing\mathpass

where <user> is your username on the computer.

You may need to adjust a setting to show hidden files.

macOS

The mathpass file is located at one of the following locations:

• /Library/Mathematica/Licensing/mathpass
• ~/Library/Mathematica/Licensing/mathpass

These files may be hidden on your computer. To navigate to a hidden folder, open the Finder application. Press Command + Shift + G to open a file search dialog and enter “~/Library/Mathematica/”. Finder opens the hidden folder.

Linux

The mathpass file is located at one of the following locations:

• /usr/share/Mathematica/Licensing/mathpass
• ~/.Mathematica/Licensing/mathpass
• /usr/local/Wolfram/Mathematica/Configuration/Licensing/mathpass

On Linux you may need to show hidden files using Control + H.