CSR Advisory document regarding realistic alternatives for gaining lawful access to end-to-end encrypted communication, other than weakening encryption

In this letter, the CSR offers advice on realistic alternatives for gaining lawful access to end-to-end encrypted communication, other than weakening encryption. In doing so, the CSR wishes to emphasise that while the alternatives in question are not likely to yield a full-fledged replacement, it is nevertheless the opinion of the Council that a broad, different approach to this issue is both valuable and necessary.