Error 401

Reader not authorized to read this file

This means one of two things: If the file you requested is in the FREE ZONE of HDCN, then you tried to access it without first registering with HDCN. To register, go to the the registration link on the home page of HDCN and register, and get a free zone loginID and password.

If you already are registered and you STILL received this message, chances are, that the file you want is in the KEY ZONE of HDCN. You can't access it until you get a paid subscription, at which time your loginID and password are upgraded to access material in KEY ZONE subdirectories. To subscribe, follow the links on the home page of HDCN

Differential diagnosis:
Look at the message on the password box. If it says "Please enter your username and loginID for the KEY ZONE of HDCN", and your FREE ZONE password is not working, then the problem is the requirement for a paid subscription.

Forgot your password?
If you're sure that you registered in the past, then you can find your password at at this password link.

Alternatively, send an email to with password in the subject line. Your password and loginID will be mailed back to you automatically.

Reinstating login that was removed due to bad email address
HDCN periodically removes logins if an email address linked to the login is no longer functional. These logins are put in an inactive file, but can be reinstated by upgrading/correcting the email.
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Password