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Re:Scribd CTO: “We Are Scrapping Flash And Betting The Compa... by Anon84 on Wednesday May 05, 2010 @07:46PM (#1323033)
The change isn't as great as it seems (at least at first). Right now their setup probably looks something like this:

PDF -> Internal Representation -> Flash viewer

In principle they should only need to change to

PDF -> Internal Representation -> HTML5 viewer

That alone should make a huge different in terms of time needed.

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.