Apparently the DOJ is threatening to prosecute security researcher Matthew Green under a provision of the DMCA for criminal copyright violation that allegedly occurred in his “research” for his book “Practical Cryptographic Engineering”. There is an excerpt from the book on this blog.
Green is a professor at Johns Hopkins University in Baltimore.
Electronic Frontier Foundation has a detailed post September 30, 2016, about the vagueness of provisions in the DMCA about indirect copyright infringement that occurs during security research. This case is difficult to follow at first and will require more detailed study.