Make a PdfViewer UserControl for Winform

I need a pdf viewer user control to show my pdf files. I have some finance pdf documents,really important invoice documents. I will give them to my customers. And then, they may copy and send my docs for free to others. I don't like that. So,you need to make 2 programs. 1. Tool that encrypts pdf file. 2. Pdf Viewer that opens encrypted pdf and shows it on winform. Reading encrypted file and showing it on winform. *)The pdf decryptor should not remain any decrypted files to anywhere. Don't paste decrypted temp file to anywhere. The project shoule be written in vs2015. And I need full source code.