We are converting PDF documents from another PDF documents and appling the security. In some documents, black background appearing (in some cases multiple colors are displaying) at the bottom of the page. Please find the attached source and generated documents.
We are using ASPOSE Pdf 6.5 version and using following code to conver the PDF.
var fileSecurity = new PdfFileSecurity(sourceFilePath, destFinalPath);
DocumentPrivilege privilege = DocumentPrivilege.ScreenReaders;
privilege.AllowAssembly = true;
privilege.AllowPrint = true;