There is a massive difference between "giving copies of my class notes to friends and posting them on the web." This is especially true if you are posting them--for profit--to a web site that is itself geared toward making profits from advertising. I know that, as a professor, I do not want notes taken during my lectures to appear alongside ads for Budweiser. (I do not object to the idea of having such notes posted to a non-profit web site--though, in that case, I would want to be given the chance to review and correct the notes.)
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There is a massive difference between "giving copies of my class notes to friends and posting them on the web." This is especially true if you are posting them--for profit--to a web site that is itself geared toward making profits from advertising. I know that, as a professor, I do not want notes taken during my lectures to appear alongside ads for Budweiser. (I do not object to the idea of having such notes posted to a non-profit web site--though, in that case, I would want to be given the chance to review and correct the notes.)