Lambda the Ultimate

In a Qilang mailing list email Marker Tarver, creator of Qi, says

In a month I will be packing to go to India; this time for an extended
period. But its also a goodbye to Qi and computing. At some point
you have to acknowledge that Qi doesn't pay its way. It was fun
though and I'm not sad about it.

Qi has been a journey that began nearly 20 years ago when I was a very
different person and worked for a university. But the book on Qi II
marks a natural watershed. I need to move on. By September I will be
gone.

Does anyone know anything about academic commons? My question is this. I have a copy of an old book listed as academic commons but not available for download. Is it leagal for a thirld party, neither the author or publisher, to post an electronic copy of such a book. Thanks in advance.