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Your premise is false as regards United States at least. The sole authority granted the government to control books is in Article 1, Section 8: "The congress shall have power...To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries."
The government lacks authority to take control of intellectual property. Eminent Domain applies to land because all land in every nation since ancient times until the present, all land belongs to the sovereign. Your purchase of land is the purchase of a freehold to develop the land, which you do own, but ownership of the land itself belongs to the sovereign and the sovereign always retains the right to reclaim what is his. (In a democracy the whole people are sovereign.)
In the United State the Bill or Rights expressly forbids the government to interfere with the free speech of the people or with the publishing of ideas. (Yeah, they were pretty well radical those founders.)
Now if you want to argue that the way DRM is presently being used to breech the rights of Authors and Publishers to the benefit of book sellers, then you might be able to make a case. But eminent domain clearly doesn't apply.
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