This article discusses how to secure multimedia messaging attachments using protected Twilio functions. It explains that while multimedia messaging is gaining popularity, the requirement for publicly accessible URLs of media files can pose privacy and security risks. The author provides a tutorial on how to protect media attachments while still being able to use them in multimedia messaging with serverless Twilio functions. The tutorial includes setting up developer environment, creating a protected function, deploying it to Twilio Functions, and sending an MMS message with the protected media provided by the function.