此刻，在我的书桌上摆放着同济大学数学系编写《高等数学》上册（第六版），定价34.40元人民币。
此书第一版发行至今大约已有30年了。据此，不难估算出同济大学数学系每年的教材版权费至少上数千万元人民币，可谓“版权发财户”。
与此相反，Keisler“Elementary Calculus”遵循知识共享（CC）协议，放飞互联网，可自由下载使用。这是什么思想境界？国内数学界的腐败之风必须反对！
附：知识共享（CC）版权的目的与目标
Purpose and Goal
Creative Commons（知识共享） hasbeen described as being at the forefront（发展前言） of the copyleft movement（版权运动）, which seeks to support the building of a richer public domainby providing an alternative to the automatic "all rights reserved" copyright,and has been dubbed "some rights reserved".[15] David Berry and Giles Moss have credited Creative Commons withgenerating interest in the issue of intellectual property and contributing to there-thinking of the role of the "commons" in the "information age".Beyond that, Creative Commons has provided "institutional, practical andlegal support for individuals and groups wishing to experiment and communicatewith culture more freely."[16]
CreativeCommons attempts to counter what Lawrence Lessig,founder of Creative Commons, considers to be a dominant and increasinglyrestrictive permission culture. Lessig describes this as"a culture in which creators get to create only with the permission of thepowerful, or of creators from the past."[17] Lessig maintains that modern culture is dominated by traditionalcontent distributors in order to maintain and strengthen their monopolies oncultural products such as popular music and popular cinema, and that CreativeCommons can provide alternatives to these restrictions.[18][19]
此书第一版发行至今大约已有30年了。据此，不难估算出同济大学数学系每年的教材版权费至少上数千万元人民币，可谓“版权发财户”。
与此相反，Keisler“Elementary Calculus”遵循知识共享（CC）协议，放飞互联网，可自由下载使用。这是什么思想境界？国内数学界的腐败之风必须反对！
袁萌 6月28日
附：知识共享（CC）版权的目的与目标
Purpose and Goal
Creative Commons（知识共享） hasbeen described as being at the forefront（发展前言） of the copyleft movement（版权运动）, which seeks to support the building of a richer public domainby providing an alternative to the automatic "all rights reserved" copyright,and has been dubbed "some rights reserved".[15] David Berry and Giles Moss have credited Creative Commons withgenerating interest in the issue of intellectual property and contributing to there-thinking of the role of the "commons" in the "information age".Beyond that, Creative Commons has provided "institutional, practical andlegal support for individuals and groups wishing to experiment and communicatewith culture more freely."[16]
CreativeCommons attempts to counter what Lawrence Lessig,founder of Creative Commons, considers to be a dominant and increasinglyrestrictive permission culture. Lessig describes this as"a culture in which creators get to create only with the permission of thepowerful, or of creators from the past."[17] Lessig maintains that modern culture is dominated by traditionalcontent distributors in order to maintain and strengthen their monopolies oncultural products such as popular music and popular cinema, and that CreativeCommons can provide alternatives to these restrictions.[18][19]