Kinsella, a legal professional in the area of IP in the US, covers the legal and historical context surrounding IP and comes to similar conclusions. In short, he concludes, you cannot have Intellectual Property rights without restricting someone else's Physical Property rights; IP is fundamentally at odds with Physical Property rights.

True to form, his book is available for free in digital formats: http://mises.org/resources/3582/Against-Intellectual-Propert...

And audio: http://blog.mises.org/11717/against-intellectual-property-au...

EDIT: clarified that Kinsella is a lawyer and knows this subject well