Microsoft has removed a blog post that advised users to train artificial intelligence models on a dataset derived from the Harry Potter book series, after it sparked widespread criticism. The post, which was later deleted, had incorrectly labeled the dataset as being in the public domain, leading to confusion and concern over copyright infringement. The dataset in question was created by a third-party developer and included text from the original Harry Potter novels, which remain under copyright protection. Microsoft had shared the dataset through its Azure AI platform as part of a tutorial on building AI models using publicly available data. However, the company acknowledged that the classification of the material as public domain was a mistake. In a statement, Microsoft said it recognized the error and promptly took down the blog post and the associated dataset. “We made an error in our guidance by suggesting that the Harry Potter dataset was in the public domain. That was incorrect,” the company said. “We are removing the content and will ensure our future resources are reviewed more carefully to avoid similar issues.” The incident raised broader concerns about how tech companies handle copyrighted material in the context of AI training. While many AI developers rely on large text datasets to improve model performance, using copyrighted works without permission can lead to legal and ethical challenges. The deletion of the post followed backlash from fans, authors, and legal experts, who criticized the suggestion that the beloved book series could be used freely for AI training. The Harry Potter books are still protected by copyright, with rights held by Warner Bros. and J.K. Rowling’s estate. Microsoft has since emphasized that it is committed to respecting intellectual property and is reviewing its content guidelines to prevent future missteps. The episode serves as a reminder of the complex legal and ethical landscape surrounding AI development, particularly when it comes to using creative works for machine learning.