Encrypt Document
Use EncryptFile option to encrypt the PDF document. The PDF documents can be encrypted to protect its contents from un-authorized access.
User Password
Use UserPassword option to provide a user level access to the PDF document. If the PDF document is opened with User password then only limited access is available. The user might not be able to Print, Copy or Edit the document.
Master Password
Use OwnerPassword option to provide an owner level access to the PDF document. If the PDF document is opened with Master password then complete access is available. The Owner can then Print, Copy or Edit the document.
Encryption Level
Use EncryptionLevel option to specify the level of encryption of the PDF document. You can specify either a low (40 bit) or High (128 bit) level of encryption.
Allow Printing, Copying and Modifying
Use PermissionsEnablePrinting, PermissionsEnableCopying, PermissionsEnableModifying option to specify which access permission should be granted when the PDF document is opened with User Password.