Server 2019 DataCenter Downgrade Rights [duplicate]

This is a Canonical Question about Licensing.

Questions on licensing are off-topic on Server Fault. If your question has been closed as a duplicate of this question, then this is because we want to help you understand why licence questions are off topic rather than just telling you "it just is". In all likelihood, this question will not address your question directly, it was not meant to.

I have a question regarding software licensing. Can the Server Fault community please help with the following:

How many licenses do I need?
Is this licensing configuration valid?
What CALs do I need to be properly licensed?
Can I run this product in a virtual environment?
Can I downgrade this product to an earlier version?
Am I entitled to feature X with license Y?

Solution 1:

Licensing is a hard and absolutely vendor-specific problem. Not only that, many vendors, especially the larger ones like Microsoft, have multiple types of licensing regimes that change pricing based on:

How large you are (either by seat count, annual revenue, or a combination of both)
What industry you're in (non-profits, education, government, enterprise, large corporation, small corporation, and SMB are all discrete licensing categories with their own quirks)
How much licensing you purchase (volume discounts vary)
What kind of contract you buy (monthly subscription versus one time payout)
Where you are located or where the licenses will be deployed
Whether you're buying off a master contract, or are making your own.

Especially for the larger companies like Microsoft, licensing is its own career-track and one that more and more often is not found in the SysAdmin/DevOps/SRE office. It is found in either your Purchasing office, your value-added-reseller's office, or the LargeCorp's sales office.

In our company we have one person who specializes in purchasing IT license-bearing software. She handles Microsoft and Adobe licensing, as well as a host of other complex entities like ESRI, MatLab, Apple, Novell, and AutoCAD. It is her entire job to know these things and we've made significant savings because she can focus her whole effort into figuring the fiddly bits out. It has saved us a lot of money. She is neither Server person or Desktop person. When license-servers need setting up I do that, but she provides the license keys that goes into them and all of the legal mucking about that does into obtaining them in the first place.

She's a licensing person, and is mostly the kind of person who can answer these questions. I'm not, neither are people like me. But even she would be hard pressed to answer questions for a 30 person small business, since she spends her entire day enmeshed in a large, public (and therefore governmental) higher-ed organization that has completely different licensing options.

So you're a sysadmin, you're still told to fix a licensing problem, and you don't have that wonderful licensing professional I rhapsodized about. What do you do?

Ask the company that makes what you want to buy. They'll at least give you some idea what market-segment they think your organization belongs in. You may even be able to buy from them directly.
Do this especially if your question is on appropriate usage of licenses.
If at all possible, ask for written answer — it's not unheard of for the sales people of larger software vendors to be lost in licensing details too.
Ask a value-added-reseller of some kind, preferably one you already have a relationship with. They deal with this a lot more than you do, and likely have such a licensing professional.
- The majors like CDW have whole departments dedicated to this.
- They will keep you inside your market segment in ways you won't even notice (this is a good thing).
Don't ask your peers, they likely don't know either. This is why your question got closed as a duplicate of this one.

Solution 2:

I know this is not the usual answer, but I felt this POV should appear somewhere in the responses. If you decide to use only free software, then in addition to the expected benefits of never being artificially constrained by your choice of software, deprived of information necessary to make it work, or unable to lawfully share it with others who would benefit from it, you get the handy side-effect of never having to worry about software licensing audits, licence counts, or licence terms (unless you redistribute software, in which case there are certain conditions, but they're very easily satisfied).

A long time ago I decided as both a personal and a commercial proposition to use only free software. If I couldn't do it with free software, at home or at work, it wasn't worth doing. My life became immensely simplified and I've never regretted the decision.

Solution 3:

One of my duties used to be (Yay! passed it on to someone else, finally!) dealing with licenses. Every so often, I'd have to dive into licensing and figure out how it worked for some vendor or another.

With Microsoft, it was about every two years: I'd talk to our reseller(s), read whatever I could find, ask questions at seminars and webcasts, and figure out what the optimal strategy was and we'd follow that as long as possible, until the situation changed. For most other vendors, it was similar, except the stakes were lower - the cost of licenses was much less, so if we ended up with extras, or a sub-optimal upgrade strategy, it wasn't as big a deal.

The point is that in order to answer your questions for my environment, I had to put in at least a couple weeks of effort every year - and that's for a network I was intimately familiar with. There's no way to shortcut that effort by asking here.