A book, whether translated at home or abroad, is of course an authoritative publishing house first. For example, humanities, business, Yilin, bookstores and so on. There is also authoritative proofreading or translation. In fact, there are many translated versions of some foreign works, and there will be some classic versions or authoritative and recognized masterpieces. Such as Shakespeare's Plays translated by Mr. Zhu Shenghao. Of course, Bian, a famous modernist poet, also translated Shakespeare's plays, but Zhu's translation has been widely recognized.

As for why many publishing houses publish the same book: there is no copyright problem in ancient books, but at most it is an authoritative problem. As for Modern Times, there will be a copyright issue. Both the heirs of the late writers and some living people have contractual reasons. After the contract expires, they can renew the contract or find a new partner. So there is a book with many publishers. Except pirated books, of course.

So many publishers don't necessarily publish pirated books.