[Harry Robinson] I have heard Windows XP has a sort of protection so that it cannot be copied. I also heard of users having to phone to get the code. Does anyone know how this really works? Is it efficient?

Also does anyone know of a good system to protect a TCL software? 

Thank one thank all (June 1 2004)

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See [source protection]. It's a good idea to run a search [http://mini.net/tcl/2?protect*] before creating a new page.