Long Term cuFFT Callback Licenses


We are developing a system using CUDA 6.5 that will be deployed long term (5+ years) that uses cuFFT callbacks. Our ideal scenario would be to upgrade to CUDA 7.0 then no license is required for cuFFT callbacks, however in due to the bug in cuFFT in 7.0 with non-blocking streams upgrading is not possible for us.

Is it possible for us to obtain a long-term (5+ year) license for cuFFT callbacks on CUDA 6.5 for use on 10-100 machines?

I have tried contacting the cuFFT team directly (via cufft@nvidia.com) as suggested by their license page, but have received no response.

Can someone point me in the right direction, or put me in contact with someone who can help us in this matter?


A patch solving the non-blocking streams issue in cuFFT 7.0 is now available for download at

The license associated with cuFFT was updated. The new expiration date is 12/31/2020. It can be obtained following the instructions in the green box on the cuFFT page: