IANAL, and it will depend on jurisdiction. But generally transformative uses that are a completely different application, and don’t compete with the original are likely to be fair use. A one-line summary is probably more likely to promote the full book, not replace it. A multi-paragraph summary might replace the book if all the key messages are covered off.
Not quite related to the topic, but I encountered several ‘books’ that can be replaced by several paragraphs of text, and this is almost as bad as making three hours video instruction where 30 seconds or a bit of text would suffice. I find it horrible that such ones are written at all
IANAL, and it will depend on jurisdiction. But generally transformative uses that are a completely different application, and don’t compete with the original are likely to be fair use. A one-line summary is probably more likely to promote the full book, not replace it. A multi-paragraph summary might replace the book if all the key messages are covered off.
Not quite related to the topic, but I encountered several ‘books’ that can be replaced by several paragraphs of text, and this is almost as bad as making three hours video instruction where 30 seconds or a bit of text would suffice. I find it horrible that such ones are written at all