密小盟 is an end-to-end encrypted instant messaging software designed to help businesses protect their intellectual property and user privacy. With the ability to support group chats of up to 200,000 people, 密小盟 ensures that data is encrypted throughout the entire communication process, with only end users having access to it. The software provides administrators with the ability to manage permissions for group members, files, images, and messages, ensuring that company materials are not leaked and member information remains secure. Additionally, 密小盟 offers businesses a dedicated channel called "联盟" where they can create their own advertisement area and establish various operational groups. This allows businesses to freely engage in user operations without worrying about information leakage.