RightsManagementInformation.SaveUseLicense(ContentUser, UseLicense) Method

Reference

Definition

Namespace:: System.IO.Packaging

Assembly:: WindowsBase.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Saves a given UseLicense for a specified user to the encrypted rights management data stream.

public:
 void SaveUseLicense(System::Security::RightsManagement::ContentUser ^ userKey, System::Security::RightsManagement::UseLicense ^ useLicense);

public void SaveUseLicense (System.Security.RightsManagement.ContentUser userKey, System.Security.RightsManagement.UseLicense useLicense);

member this.SaveUseLicense : System.Security.RightsManagement.ContentUser * System.Security.RightsManagement.UseLicense -> unit

Public Sub SaveUseLicense (userKey As ContentUser, useLicense As UseLicense)

Parameters

userKey: ContentUser

The user of the UseLicense.

useLicense: UseLicense

The use license to store and embed in the package.

Exceptions

ArgumentNullException

Either the userKey or useLicense parameter is null.

FileFormatException

The rights management information in this package cannot be read by the current version of this class.

Examples

The following example shows how to use of the SaveUseLicense method.

WriteStatus("   Signing the UnsignedPublishLicense\n" +
            "       to build the PublishLicense.");
UseLicense authorsUseLicense;
PublishLicense publishLicense =
    unsignedLicense.Sign(_secureEnv, out authorsUseLicense);

WriteStatus("   Binding the author's UseLicense and");
WriteStatus("       obtaining the CryptoProvider.");
CryptoProvider cryptoProvider = authorsUseLicense.Bind(_secureEnv);

WriteStatus("   Creating the EncryptedPackage.");
Stream packageStream = File.OpenRead(packageFile);
EncryptedPackageEnvelope ePackage =
    EncryptedPackageEnvelope.CreateFromPackage(encryptedFile,
        packageStream, publishLicense, cryptoProvider);

WriteStatus("   Adding an author's UseLicense.");
RightsManagementInformation rmi =
    ePackage.RightsManagementInformation;
rmi.SaveUseLicense(author, authorsUseLicense);

ePackage.Close();
WriteStatus("   Done - Package encryption complete.");

WriteStatus("Verifying package encryption.");
if (EncryptedPackageEnvelope.IsEncryptedPackageEnvelope(encryptedFile))
{
    WriteStatus("   Confirmed - '" + encryptedFilename +
                "' is encrypted.");
}
else
{
    MessageBox.Show("ERROR: '" + encryptedFilename +
        "' is NOT ENCRYPTED.", "Encryption Error",
        MessageBoxButton.OK, MessageBoxImage.Error);
    WriteStatus("ERROR: '" + encryptedFilename +
                "' is NOT ENCRYPTED.\n");
    return false;
}

WriteStatus("   Signing the UnsignedPublishLicense" & vbLf & "       to build the PublishLicense.")
Dim authorsUseLicense As UseLicense = Nothing
Dim publishLicense As PublishLicense = unsignedLicense.Sign(_secureEnv, authorsUseLicense)

WriteStatus("   Binding the author's UseLicense and")
WriteStatus("       obtaining the CryptoProvider.")
Dim cryptoProvider As CryptoProvider = authorsUseLicense.Bind(_secureEnv)

WriteStatus("   Creating the EncryptedPackage.")
Dim packageStream As Stream = File.OpenRead(packageFile)
Dim ePackage As EncryptedPackageEnvelope = EncryptedPackageEnvelope.CreateFromPackage(encryptedFile, packageStream, publishLicense, cryptoProvider)

WriteStatus("   Adding an author's UseLicense.")
Dim rmi As RightsManagementInformation = ePackage.RightsManagementInformation
rmi.SaveUseLicense(author, authorsUseLicense)

ePackage.Close()
WriteStatus("   Done - Package encryption complete.")

WriteStatus("Verifying package encryption.")
If EncryptedPackageEnvelope.IsEncryptedPackageEnvelope(encryptedFile) Then
    WriteStatus("   Confirmed - '" & encryptedFilename & "' is encrypted.")
Else
    MessageBox.Show("ERROR: '" & encryptedFilename & "' is NOT ENCRYPTED.", "Encryption Error", MessageBoxButton.OK, MessageBoxImage.Error)
    WriteStatus("ERROR: '" & encryptedFilename & "' is NOT ENCRYPTED." & vbLf)
    Return False
End If

Remarks

After the UseLicense for the specified user has been saved, it can be retrieved through the LoadUseLicense method and from the collection returned by GetEmbeddedUseLicenses.

A Package can store the UseLicense rights information for multiple content users. Each ContentUser can have at most one UseLicense. If SaveUseLicense is called to store a new UseLicense for a ContentUser that already has a UseLicense, the previous license will be overwritten with the new license.

Applies to

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