PdfSaveOptionsSetOneTimePasswords Method

public void SetOneTimePasswords(
	SecureString userPassword,
	SecureString ownerPassword = null,
	PdfAccessPermissions permissions = PdfAccessPermissions.Default,
	bool encryptMetadata = true
)

Public Sub SetOneTimePasswords ( 
	userPassword As SecureString,
	Optional ownerPassword As SecureString = Nothing,
	Optional permissions As PdfAccessPermissions = PdfAccessPermissions.Default,
	Optional encryptMetadata As Boolean = true
)

Parameters

userPassword

Type: System.SecuritySecureString
The user password.

ownerPassword (Optional)

Type: System.SecuritySecureString
The owner password.

permissions (Optional)

Type: Atalasoft.PdfDocPdfAccessPermissions
The set of allowable actions for PDF document.

encryptMetadata (Optional)

Type: SystemBoolean
a boolean indicating that metadata stream should be encrypted. Ignored for PDF version below 2.0.

PDF documents have two passwords associated with them, a user password and an owner password. If an encrypted document is opened by a conforming reader using the owner password, then the security Permissions are ignored. If an encrypted document is opened by a conforming reader using the user password, then the security Permissions are enforced. When a document is created with only one password or one unique password, it is considered the same as having only an owner password.

PDF/A standard does not support encryption and password-protected access permissions.

Reference