I'm unsure which open source license applies to poppler. The README specifies GPL without a version: Please note that xpdf, and thus poppler, is licensed under the GPL, not the LGPL. Consequently, any application using poppler must also be licensed under the GPL. Additionally, README-XPDF specifies GPL v2 or GPL v3, but: Please note that Xpdf is NOT licensed under "any later version" of the GPL, as I have no idea what those versions will look like. However, most of the files in the poppler/ folder contain "GPL v2 or later" file headers, for example poppler/Annot.cc: // All changes made under the Poppler project to this file are licensed // under GPL version 2 or later So it is clearly some variation of the GPL, but which one?
You really need to get yourself a lawyer, you can't go trusting what random people say on the internet about legal things ;) But i'll give you a non lawyer non binding answer, the obvious answer is GPL2 or GPL3
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