How to encrypt PDF with ASP

Classic ASP calls the component through COM. Use a 32-bit application pool with the 32-bit build, or a 64-bit pool with the 64-bit build; mixing bitness is the most common cause of CreateObject failures.

The sample loads a PDF, encrypts it with a permission mask and writes the result to disk.

Before you start

1. Install the DLL on the web server and register it for the application-pool identity.
2. Confirm the application pool's 32-bit setting matches the installed build.
3. Place the source and destination folders outside the web root or protect them with NTFS permissions.
4. Call SetLicenseKey() before processing.

Complete example

<% 
Dim obj
path = server.MapPath(".")
Set obj = CreateObject("PDFEncryptX.EncryptLib")
iRtn = obj.LoadFromFile("..\PDFEncryptX.pdf", "")
obj.SetLicenseKey "Your code here"
'Create Permissions: Can not to print, copy and edit.
iPermissions = obj.CreatePermission(0, 0, 0, 1, 1, 1, 1, 1)
'Call Encrypt() method
iRtn = obj.Encrypt("..\PDFEncryptX_CanNot_Print_Copy_Edit.pdf", 2, iPermissions, "owner", "user")
Response.Write "Encrypt() Return code:" & CLng(iRtn)
set obj = Nothing
%>

How it works

• IIS application pools recycle; release objects with Set obj = Nothing.
• The account running the pool needs read access to the input and write access to the output folder.
• Do not expose license keys in client-side code; this runs server-side only.