Accounts limit means maximal number of unique broker accounts where Product can be launched. Every new account number where Product is launched increments accounts counter. When accounts counter reaches account limit then is not possible to run Product on any new accounts (still is possible to run Product on already used accounts).

Expiration means time period when you can use the Product counted from licence creation date (when your licence for using Product is created). When your licence is expired you are not able to use the Product further.

Account limits and/or Expiration for the Product can be extended by extra packages (products) made for that purpose.