This is an Android App that removes Watermark from PDFs which are scanned by CamScanner app.
iText is used for editing PDFs in Android. As iText is licensed as AGPL software, so you should buy its license if you want to use it for commercial purposes.
Blog Post explaining the project : https://viveksb007.wordpress.com/2018/08/13/using-itext-to-edit-pdf-in-android/
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This software is licensed under MIT license.