转换PDF文件的不同版本的兼容性的目的之间。 每个PDF文件是根据一个规范生成或生产。该规范已经演变从版本1.0到2.0版本。有时用户都面临着一个特定的应用程序只能识别PDF文件的一个特定版本的窘境。例如,一些期刊出版商只接受提交的1.4或更高版本的PDF文件,一些过时的Windows应用程序只能读取1.2版PDF文件。假设你有1.1版本的PDF文件,你会想做什么?...
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