http://forum.cakewalk.com/FindPost/3692074Info from Noel Borthwick via Wookiee.
From Wookiee:
Re Authorisation of SONAR in the future I PM'd Noel and he said if the Cake servers are to be shutdown all legal owners will be issued with a file that will allow for authorisation on new installs or reinstall's. :) 8)
https://www.facebook.com/groups/sonarusergroup/See post by Tracy Towns - read further into the thread and you’ll read Noel Borthwick himself confirms his comments as above.