Chris Rowett is the author. Here's one of Chris's early answers to that question. No announcement about open-sourcing LifeViewer has been made, so it's safe to assume that the answer hasn't changed.
Last I heard, one reason behind that decision is that LifeViewer is highly experimental code, and Chris used the project to learn JavaScript and HTML5. The code would likely have to be rewritten from the ground up to make it really open-source-compatible -- i.e., to make it so that someone who didn't write the code might have a chance of having a pleasant experience when trying to modify it.
That said, it is definitely possible, and not forbidden or restricted in any way, to borrow LifeViewer code as it stands and put it on a stand-alone Web page.