Is it obligatory to seek permission before copying articles from websites that do not own rights or whose owners cannot be contacted, and from websites that do have rights? And is rephrasing an article taken from a copyrighted website considered an infringement of its rights?

It is permissible to copy articles from websites that do not prohibit it, and there is no need to seek permission from their owners. However, it is not permissible to copy from websites that do prohibit it, except with the permission of their owners. It is permissible to quote from all published articles, provided that the sources are mentioned and the كلام (words/statement) is attributed to its rightful owners.