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A free textbook is a textbook that can be read, used, copied, modified and redistributed without any restrictions. The word ''free'' in the term ''free textbook'' refers to freedom (liberty) and is not related to monetary cost. A free textbook is released under a free license that ensures that people will have the freedom to read, use, copy, modify, and redistribute the textbook. The notion of a free textbook derives from a more general notion called Free Cultural Work that was inspired from the definition of Free Software. ==Free licenses== Often free textbooks are released under the following free licenses: *Creative Commons Attribution () *Creative Commons Attribution Share-Alike () *GNU Free Documentation License () However, there are more free licenses under what a free textbook can be released. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Free textbook」の詳細全文を読む スポンサード リンク
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