I have a DataCamp for Business subscription. When does a license I've purchased become active? Is it immediately upon purchasing the license, or once it is assigned to a DataCamp Member? Can I "freeze" purchased licenses in order to avoid getting charged for unused licenses?
Purchased licenses are part of the Organization from the time of payment. They are considered active immediately upon purchase.
Licenses are valid for the entire duration of your subscription, regardless of whether or not a Member has utilized the License, or if it has been assigned.
For an example, if you purchased 3 Licenses for your Organization on May 3rd, 2018 with a subscription end date of May 3rd, 2019, then all 3 of those licenses will be valid and active until May 3rd, 2019, even if some or one of the Licenses were never used.
There is not a way to put Licenses on-hold or "freeze" them. Please keep in mind for future reference, to avoid having more Licenses than you need.
If you purchased a small number of licenses at the time of registering, you can add Licenses at any time when they are needed.