Winnovative.PdfSecurity.NetCore (nuget): Winnovative PDF Security library for .NET Core can be linked into any .NET Core application, either ASP.NET Core web sites or desktop applications, to add pdf encryption capabilities to your application.  The Winnovative PDF security for .NET Core can be used in any type of application to manage the security settings of the PDF documents. You can encrypt the PDF content, add user and owner passwords, control the PDF document permissions for printing, copying, assembling, filling forms, editing content, editing annotations, etc or you can specify the length of the encryption key to 40 or 128 bits, remove all the security settings by providing the user or owner password.   The integration is extremely easy and no additional installation  is necessary in order to get started. It's just a .NET Core assembly that you have to reference in your application.
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