Copyright differences, legality and quality assurance differences.

1. Copyright difference: The genuine Yucun Notes is a version authorized by a legal publishing house and has complete copyright protection. The publisher and author obtained the copyright of the work through legal channels and obtained legal publishing permission. Pirated Yucun Notes are unauthorized and illegal copies or disseminations, without the permission of the copyright owner, infringing on the author's copyright.

2. The difference between legality and quality assurance: Genuine Yucun Notes are legal. Readers can purchase truly genuine books through formal channels and enjoy legal reading rights. Genuine books have been edited, proofread and reviewed, and their quality is guaranteed. Their content and layout design meet the requirements of the publishing house. The legality of the pirated Yucun Notes is questionable. There are problems with writing and typesetting, and the quality cannot be guaranteed.