As we posted in our article Mac OS 10.12 Sierra - Pro Audio Compatibility Update we have covered that Cedar Studio was not compatible with macOS Sierra because the HASP copy protection used by Cedar Audio is currently not supported by Cedar Audio for use on macOS Sierra. This announcement was made by Cedar Audio on October 1st 2016...

When introducing OS X 10.12 (macOS Sierra), Apple introduced some issues for software developers. Currently, CEDAR Studio will not run on Sierra so, if you upgrade an existing system to this, or install CEDAR Studio on this, you will obtain an HSP dongle security error and the software will not function. CEDAR Audio is working with its partners to overcome this as quickly as possible. Windows/PC users are not affected.

Even though Gemalto, the makers of the Sentinel HASP copy protection system that Cedar use, have released an update that supports macOS Sierra (v7.5.3 released on 9th Jan 2017 and 7.5.4 released on 9th March 2017). Cedar Audio was is still not officially supporting macOS Sierra for Cedar Studio because of the incompatibilities between macOS Sierra, Pro Tools and its existing HSP dongle, CEDAR Audio has now announced CEDAR Studio for iLok to be released in by the end of June 2017. Gordon Reid, Managing Director of CEDAR Audio explained...

We are very grateful to our customers who have been delaying their upgrades to Sierra for many months while we tried to find a solution to this problem. However, it became clear some time ago that it was unlikely that we would be able to continue with the HSP dongle for Pro Tools users on the Mac. We have therefore been working on CEDAR Studio for iLok since 2016 and feel that it's time to let everyone know that this will be available not too far in the future. Adopting the iLok will also make it possible for us to offer additional benefits such as downloadable product and demonstration software to run on existing dongles. While there are still some details to be ironed out, we should have everything in place by the summer, and we'll make a further announcement as soon as firm information is available.

CEDAR for Pyramix™ and CEDAR Studio on other platforms will continue to be protected by the CEDAR HSP dongle.