Lawyer Shang Jiangang of Shanghai Qianhe Law Firm stated that netizens have copyright in their posts on the website. If they indicate "No reprint" in the post, other units or websites may not reprint this, otherwise they are deemed Infringement: If there is no relevant statement in the post, according to relevant regulations, other units or websites can reproduce it, but must pay the manuscript, otherwise it will be considered infringement. According to this article, what is the correct understanding? ['Online works are protected by law.', 'Online infringement is difficult to define.', 'The site can reprint any post.', 'Compensation for online works is not well calculated.']