marxist theory on intellectual property

So, I have weird dreams. Last night I had a dream about ideas. Specifically I had a discourse on Intellectual Property and Marxist theory.

Here's my question:

Does the creation of intellectual property effectively lower the bar on ownership of the means of production to the point where Marx would not have been capable of drawing the conclusions he does?

Does property that is purely abstract act differently under his theories than those necessarily tied to physical objects?

Does the ACLU's recent position that one cannot patent purely abstract ideas undermine this concept?

Marx himself wrote (and died) before the Berne Convention, but clearly not before a long history of copyright and patent law already existed.

The contentiousness of the subject of ownership of intellectual property in Wikistan seems to be reflected in the first wholely inadequate wikipedia page I personally have ever come across, that of intellectual property. For future refernce, wikidorks, a page that provides the history of the use of a term is not the same thing as a page that describes the history of the underlying subject.

I suppose I'll have to go re-read me some K. H. Marx now to see if he got down into this level of detail.