And yes, I had been able to reinstall without the least problem. Nice!
I have also several products from Applied Acoustic Systems. They too register their products by Challenge/Response. For all their products they have the same common policy (here is the text extracted from the page of Tassman):
Can I re-authorize Tassman 4 if I upgrade or change my computer, or have a computer crash?
The license agreement for Tassman 4 allows authorization on up to two computers which belong to you. You might need, however, more than two authorizations if for example, you get a new computer or change some piece of hardware such as the hard drive. In these situations, it won't be a problem to obtain additional authorizations.
With your product serial number, you will be able to generate two different authorizations every 90 days directly from our website. Beyond that threshold, you will have to provide an explanation of why you need an additional authorization
So we can see that they have nearly the same terms as Native Instruments, but it is easier in AAS with their periodic 90 day threshold without having to email them each time a very grave problem occurs by a definitive crash of a computer.
I also have the Korg Legacy Collection having C/R registration. Korg allows the simultaneous installation on all the computers that you want, the restriction being to use only one at a time. You can read Q7/A7 and Q8/A8 at the bottom of this page:
When I bought a new laptop three months ago (I have now 2 laptops and 1 main tower) I installed all my KLC on this third computer as well as on the two other computers... At he first launch of each element of the KLC it has just automatically showed me the procedure to activate this third computer for each element of the KLC (a bit fastidious), I did it as mentioned on the little windows, and all works perfect on my main computer (64 bit) and on my two laptops (one is 32 bit, the other 64 bit).
It is exactly the same with my Cakewalk products:
And almost the same with IK Multimedia which allows the installation on up to ten different computers but with the restriction of only three simultaneously (after the total of ten computers you must pay up for a new series of ten, but phew... you can reinstall as many times as you want on a same computer without having to lose a point in the count of authorizations).
With IK Multimedia products, many people do a confusion between registration and authorization. Registration is only once (at the very fist installation after the purchase), and it imply a first authorization of course. A new authorization is needed only for a new computer (to authorize the motherboard of the computer to use the product), not at each installation on a same computer (a reinstallation on a same computer needs simply to resend the same authorization, not to create a new one).
Installation on three computers simultaneously (see the chapter 2):
And a max of ten registrations (i.e. ten computers) along the time (for example I have my Sampletank XT installed on two computers, one of these two computers having known three successive installations last year for technical reasons... and I can see that the number of remaining authorizations is not 10-1-3=6 but indeed 10-2=8).