>(12a) In the light of the more limited risk of their use for the purpose of child sexual abuse and the need to preserve confidential information, including classified information, information covered by professional secrecy and trade secrets, electronic communications services that are not publicly available, such as those used for national security purposes, should be excluded from the scope of this Regulation. Accordingly, this Regulation should not apply to interpersonal communications services that are not available to the general public and the use of which is instead restricted to persons involved in the activities of a particular company, organisation, body or authority.

From document 11277/24 [1]. Unless it has changed more recently, the exemption is actually considerably broader, and presents the unusual argument that the system will be secure enough for any private personal communications, yet too insecure for any company's trade secrets (which, apparently, have the same weight as national security).

[1]: https://data.consilium.europa.eu/doc/document/ST-11277-2024-...