I've thought about this whole electronic property stuff, and I just don't have a certain answer; I would suggest, however, that, because you have paid for the material in the past and so have remunerated the publisher for their costs, you're not doing any real harm in downloading an electronic version now.
Secondly, the Venerable would likely not mind if you had an electronic copy of his material, seeing as it is dhamma and he's in the habit of being open handed with that stuff. Actually, this point should be firstly, and the point above should be secondly.
This argument is not water tight, as it could be seen that you're depriving the publisher of potential earnings. But to me this is silly, and to allow it to stand would allow us to be forced to make all kinds of purchases we just don't want. "Buy this TV", "No, I don't need it.", "Buy it, or you're depriving us our earnings and will be taken to court."
Anyway, that's all I got right now.