Yes, when activating your games through major downloading platforms, you respect the DRM standard, and assure that the publisher gets his due, as those platforms guarantee your game is valid.
Some retailers offer you the chance to get your game’s official retail box through delayed shipping, so you can rest assured that your game is not counterfeit.
Check the Steam list of games that can be activated with a CD-Key.
If you are still having doubts about the offers available, you can pick an official stamped retailer:
We guarantee 100% the use of those merchants as they have an operating agreement with the publishers.
To ensure maximum safety and reliability, the DLcompare team regularly and anonymously buys games among its partners, in order to check delivery times as well as the ability of the customer support to respond and solve the most common problems.