Reference: ad-Durr ath-Thameen fee Tarjamati Faqeehil-Ummah al-‘Allaamah ibn ‘Uthaymeen – Page 218.
Shaykh Fahd ibn ‘Abdillaah as-Sunayd narrates :
As for his asceticism (zuhd), then it is sufficient to know that all his books which have been printed with his permission are for noble charitable causes. Additionally it has been made a condition for those who print his books that they do not hold any rights over the books should anyone wish to print them and freely distribute them.