The original request of this thread may be exactly what tutorial authors should be doing from a legal standpoint.
Clickwrap Agreement: From wikipedia
http://en.wikipedia.org/wiki/Clickwrap_contract
"The terms of service or license do not always appear on the same webpage or window, but are always accessible before acceptance, such as through a hyperlink embedded in the product's webpage or a pop-up screen prior to installation. In order to be deemed to have accepted the terms of service, the purchaser must be put on notice that certain terms of service may apply. If the terms of service are not visible and/or accessible, courts have found the notice requirement to be lacking and as such, the purchaser may not be bound to the terms of the agreement."
While I do feel that ethics play a very important part of this, the legal requirements are even more important, if one truly wants to protect their intellectual property.