Are you asking about activations on the Market?one activation per PC (hardware) per OS.
Forum on trading, automated trading systems and testing trading strategies
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Sergey Golubev, 2017.07.17 07:56
Buy the tools in the market - activation
How to buy a Trading Robot in MetaTrader Market?
Everything starts with the Activation in the Market. When you buy a product you do not actually get the product itself but the right to use it an unlimited number of times, but on a limited number of computers. This parameter is set for each paid product individually and it is disabled for free products.
After one activation you can use the product on a computer without any restrictions. You will not be able to download the copy of the product on another computer. If you installed the file manually, you will not open it either. Number of activations can be found on the page with a detailed description of the product in the column with its specifications (described above).
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Sergey Golubev, 2016.09.29 12:36
If it is about the Market so the buyer can use EA according to the number of the activations which are linked to the PC and OS:
Rules of Using the Market Service -
So, 1 activation = unlimited using on 1 PC (one particular computer - hardware) with one OS (Operating System, for example - with Windows 8.1).For example, if I buy your EA via the market with 1 activation so I can use it on one my PC only with my OS (Windows XP for example) only. And I can not use EA on the other computer, and I can not use EA with same computer with different OS. So, this is the protection: even if someone can get your EA remotedly (from you or from the buyer) so he/she can not use it: he/she have to buy this EA with the activation fro the market (from you for example).