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Flattening PDF files

I have renewed our Developer Support contract, but the paid support page still says expired.

We need to prevent our customers editing the pdf files that we send to them.
Our customers will not accept any file that requires a signature or password. We, therefore, need to make our pdfs a little more difficult to edit.
I use doc.flatten to flatten form fields on the pdfs, but I can still edit them in Adobe Acrobat Pro DC. When I select tools-Forms Adobe Acrobat finds all the text and image fields.
I have attached a typical pdf file that we send to customers.
Thank you
Derek Williams

8.5_11 PO.pdf (341.8 KB)

@Derek_Berek

We tested the scenario using Aspose.PDF for .NET 20.6 and noticed that elements can still be selected in output PDF. We have logged an issue as PDFNET-48498 in our issue tracking system and will let you know as soon as we have some updates regarding its resolution. Please be patient and spare us some time.

We are sorry for the inconvenience.

Please create an inquiry in our Purchase forum where you will be assisted accordingly.