The Change Metadata feature allows users to change the metadata of PDF documents, such as title, author, creation date, modification date, etc. This is useful for users who need to update or modify PDF document metadata. For example, in academic papers, users may need to update the title or author information of papers for referencing and distribution; in enterprise document management, users may need to update the creation date or modification date of manuals or guides for archiving and auditing. Additionally, this feature can be used to remove all metadata from PDF documents for better document management and control. By using the change metadata feature, users can ensure document metadata accuracy and consistency and easily manage and distribute them.