^ "Nitro PDF Professional 5.5.1 Release Notes" (PDF).Archived from the original (PDF) on 14 December 2013. ^ "Nitro PDF Professional 6.2.1 Release Notes" (PDF).Archived from the original (PDF) on 26 November 2013.
Archived from the original (PDF) on 29 March 2016. Archived from the original on 30 December 2017.
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