የእርስዎን ሲያስቀምጡ እና የይለፍ ቃሉን ሲጠይቅ ፣ ባይወጣም መተየብ አለብዎት (በትክክል ማንም ሰው እንዳያየው አይወጣም)
as long as you give link to your source and do not claim it as your own and the publisher does not have restrictions on his/her agreement [which they don' t since its free], i don't see any problems.