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Re:Scribd CTO: “We Are Scrapping Flash And Betting The Compa... by tyler on Wednesday May 05, 2010 @07:58PM (#1323059)
Most things certainly are simple in principle.
Re:Scribd CTO: “We Are Scrapping Flash And Betting The Compa... by Anon84 on Wednesday May 05, 2010 @08:44PM (#1323171)
I'm not saying it's trivial... just that they are not exactly restarting from scratch.

Never having done something similar myself, I would expect the hardest part to be correctly parsing the original PDFs and dealing with the varyiaty of PDF generators out there.