As I just noted on the Zork I talk page a moment ago, I'm afraid you've mixed up ifiction.org, which I own, and infocom-if.org, which I don't.  Though in re-reading my original comment just now, I can certainly see how my poor wording would lead to that misunderstanding.  Sorry about that.  Since your suggestion here is still a good one if applied to ifiction.org, I should point out that while Activision's permission is not mentioned on my Infocom page at the moment, there is a reference to it on my credits page.