Which of the following actions does not require copyright permission?

Posting an excerpt with a link to the original does not require copyright permission primarily because it falls under the fair use doctrine, which allows limited use of copyrighted material without permission from the copyright holder. This principle supports activities like commentary, criticism, teaching, or research. By posting a short excerpt along with a link to the original work, you're effectively providing context and directing traffic to the original source, which can also be seen as promoting the work rather than repurposing it entirely.

In contrast, options that involve reproducing an entire book, using a copyrighted song in a film, or printing a full chapter in a newsletter are acts that typically require securing permission from the copyright owner, as they may represent a significant use of the copyrighted material that could affect the market value of the original work. Understanding these distinctions is crucial for anyone working in public relations or related fields, as it helps navigate the complex landscape of copyright law.