Classical texts (800+ years old) are in the public domain. However, (the English text) are copyrighted by the translator or publisher. If you find a free Majma 39- Al-bayan English Pdf on a random blog, verify that it is either:
Such a PDF would commonly include:
Scholars like Shaykh Shaltut of Al-Azhar have praised the work for its "straightforward way of presentation and high ethics," viewing it as a tool to dispel misunderstandings between Muslim communities. Majma 39- Al-bayan English Pdf