Software Assurance provides you with access to all Upgrades & Updates at no further cost for N years. Usually, upgrades are sold at the expense of around 65% of a full purchase, while Software Assurance is priced at 30-55% of a full purchase for 1-3 years. This provides you with a discount on the next version of THE PRODUCT should it be released within your software assurance period.
Software Assurance can be purchased at any time as long as you own the latest 10.0 version of THE PRODUCT.
With Software Assurance, you may download & use every minor update and any new Major Version made available within your Software Assurance Period. For example, if you purchased 10.x, you can upgrade free of charge to 10.0.1, 10.1.1 and so forth.
In the above example, if version 11.0 is released within your Software Assurance Period, you would receive that major upgrade at no extra cost.
Without Software Assurance, you may download and use every minor update made available for the purchased version, for example, if you purchased version 10.x, you could upgrade free of charge to 10.0.1, 10.1.1 and so forth.
To upgrade to the next major release (e.g., 11.0) requires the payment of an upgrade fee.