> When you download a paper from JSTOR or ScienceDirect, it > is quite easy for them to add various watermarks to the > PDF, and they already do (mildly).

> When you download a paper from JSTOR or ScienceDirect, it > is quite easy for them to add various watermarks to the > PDF, and they already do (mildly). You can strip the watermarks with a tool called pdfparanoia. https://github.com/kanzure/pdfparanoia https://github.com/kanzure/pdfparanoia disclaimer: I wrote pdfparanoia because watermarks.