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iText 5 is the previous major version of iText's leading PDF SDK. iText 5 has been EOL, and is no longer developed. Switch your project to iText 7, integrating the latest developments.
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Although StackOverflow is a forum where developers post technical questions and technical questions only, we notice that some developers also want to know more about the legal aspects of using open source, more specifically: is it legal to use iText for free? Is there a license fee involved?