https://devzone.nordicsemi.com/f/nordic-q-a/8690/no-longer-require-a-product-key-for-nrf51-sdkHello, There&#39;s lots of questions and back and forth talking the nrf51 SDK both on here and on other sites, about the requirement for a product key to access and download the SDK. However, I&#39;ve seen one page (not on a Nordic owned site) that saysen-USTelligent Community 13Thu, 13 Aug 2015 10:25:43 GMThttps://devzone.nordicsemi.com/thread/31863?ContentTypeID=1Thu, 13 Aug 2015 10:25:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3eb162bc-ae6f-4f9f-a5a7-e00afc6e6ed8Michael<p>Hi, That&#39;s great - I thought that was the case, but thought confirmation would be useful. Many thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31862?ContentTypeID=1Wed, 12 Aug 2015 17:12:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6d75e945-6492-4588-92d7-b4eb017cf2a7Stian R&#248;ed Hafskjold<p>Hi,</p> <p>A product key is no longer required to download the SDK. If you click on the &quot;SDK and Documentation&quot; tab on top of this site you will find a download link to the SDK (<a href="http://developer.nordicsemi.com/)">developer.nordicsemi.com/)</a>, as well as a link to the Nordic Infocenter (<a href="http://infocenter.nordicsemi.com/)">infocenter.nordicsemi.com/)</a> which contains all documentation for the nRF51 chip.</p><div style="clear:both;"></div>