Final answer:
The Copyright Act of 1976 did not include digital rights management regulations; these technologies and concepts emerged after the act was passed and became more significant in the digital age.
Step-by-step explanation:
The major change in copyright law NOT made in the Copyright Act of 1976 was d) Digital rights management regulations. The Copyright Act of 1976 included significant changes such as a) lengthening the copyright duration to the life of the author plus 70 years, b) implementing fair use guidelines that allow limited use of copyrighted materials without permission under certain circumstances, and c) protecting unpublished works by granting them the same protections as published works. However, digital rights management, or DRM, which refers to technologies used to control the use of digital content and devices after sale, was not included in this act, as it was a concept and technology that came to prominence later on with the digital age and the advent of internet distribution.