NVS waived its registration rights for any shares to be offered by IDIX under IDIX’s (not yet activated) shelf registration. Thus, NVS’ waiver of registration rights lasts until the shelf is either: i) used up with respect to the dollar ceiling; or ii) expired due to an elapsed time of three years from the date it becomes activated.
I expect IDIX to be acquired before either of the above conditions comes to pass.