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我已经购买了纸质书，但是有时候想在电脑上看，能不能得到一份PDF? #78

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chopin1998 opened this issue Mar 16, 2020 · 1 comment

chopin1998 commented Mar 16, 2020

可以打上水印或者加密什么的

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chopin1998 commented Mar 16, 2020

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