Email Encryption and Rights Protection

@Caroline Shin,  How does this affect the ability to conduct eDiscovery searches for keywords in messages? Occasionally customers have trouble locating a message that they have received or sent or maybe deleted and can only remember vague details, or we may be searching for messages that need a legalhold action based on content. My understanding is if a message is encrypted, the content will not be searchable unless the eDiscovery admin has access to the encryption keys (?)