2.2.4.4.2 Attachments to the Rights-Managed Email Message

All attachments in the message MUST be stored in the Attachment List storage. The contents of the attachment MUST be encrypted with the same publishing license as the Message object if the associated application supports rights management. In the typical case, the unmodified bits of the attachment are stored in this storage. However, if the file type of the attachment supports rights management, the attachment is also rights-managed. When rights-management protection is applied to attachments, the same issuance license that is used to protect the message is used for the attachment. The structure of each encrypted attachment conforms to the specifications for its file type. To view a rights-managed attachment, the file has to be opened and unencrypted in its native viewer.

The fields of the Attachment List storage are specified in the following table.

Field name	Stream/storage	Description
Attachment Info	This stream MUST be present.	Specified in section 2.2.4.4.3.
MailAttachment N	This storage MUST be present.	N represents the attachment number that starts from zero and is incremented with each attachment, as specified in section 2.2.4.4.4.