Debenu PDF Tools Pro lets you protect your PDF files by adding open passwords, document permissions and digital signatures to PDF files. 128-bit AES and 256-bit AES encryption supported.
Adding an Open Password to a PDF file prevents users without the password from opening and viewing the PDF files. Additional control is provided through the ability to add Document Permissions which prevent operations such as printing, changes to the document, page extraction and more.
Debenu PDF Tools Pro lets you add visual digital signatures and invisible document level digital signatures. A visual signature includes a document level digital signature as well as a visual representation of that signature on the page in the PDF.