If you want to learn more about merger, you need to study up on #Kregos and #Eckes, which are beautifully explained in the "Open Intellectual Property Casebook," a free resource created by Jennifer Jenkins and James Boyle:

https://web.law.duke.edu/cspd/openip/#q01

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Open Intellectual Property Casebook | Duke University School of Law

The 2018, 4th edition of Intellectual Property: Law & the Information Society—Cases and Materials by James Boyle and Jennifer Jenkins is now available for sale or free download under a Creative Commons license.