I've been able to test it only on few configurations. It's a freeware and so can be distributed freely. You can put it on any website or CD-Rom but please, let me know if you do so. Matrix Screensaver is just an application, so launch it and leave it in the background. It could be a good idea to put an alias of it in the Startup Items folder of your System folder.
Many settings are available.
Please refer to the ReadMe file included with Matrix Screensaver for more informations. So, if you use only the keyboard for several minutes, the screensaver should activate itself.