This directory contains the tools needed to decrypt the training
videos sold by Marshall Kirk McKusick and downloaded from this
site. The key for this Railtown.dmg.aes-256 video is 0x7b9e2f035d8a146c.

The shell script "decryptit.csh" is used to decrypt one or more lectures.
The decryptit function is used as:

	decryptit.csh Key Destdir lecture [lecture] ...

For example to decrypt the Railtown.dmg.aes-256 lecture into the current
directory one would use:

	decryptit.csh 0x7b9e2f035d8a146c . Railtown.dmg.aes-256

Or to decrypt the Railtown.dmg.aes-256 lecture in the current directory
into /var/tmp/Railtown.dmg, one would use:

	decryptit.csh 0x7b9e2f035d8a146c /var/tmp/ Railtown.dmg.aes-256

The decryptit.csh shell script uses the openssl(1) command to
do the decryption which it expects to find in /usr/bin/openssl.
If openssl is in a different directory or has a different name,
edit the OPENSSL definition at the top of decryptit.csh to
specify the correct path/name for your system.

	Marshall Kirk McKusick
	January 19, 2019