So many articles where created shortly before the release and after the release of Studio 2015. This might cause a problem...you probably cannot keep track of all the new information :)

I will keep this post extremely short with an overview of Knowledge Base articles that are available (so far) about the licensing of SDL Trados Studio 2015:

About How-To / Know-How

• #4884 - Overview: Licensing Server Toolkit versions supported per SDL Trados Studio version
  
• #8323 - How to view the Deactivation Certificate for a Single-User License
  
• #8311 - Changing the SDL License Server details in SDL Trados Studio 2015 (or later)
  
• #8303 - How to borrow or return a borrowed network license for SDL Trados Studio 2015 or later
  
• #8311 - Changing the SDL License Server details in SDL Trados Studio 2015 (or later)
  

About online/offline (de-)activation processes

• #8349 - Online activation and deactivation of a Network License for SDL Trados Studio 2015 and later
  
• #8286 - Offline activation of a Network License for SDL Trados Studio 2015 and later
  
• #8295 - Online activation of a Single User License for SDL Trados Studio 2015 and later
  
• #8297 - Online deactivation of a Single User License for SDL Trados Studio 2015 and later
  
• #8287 - Offline activation and deactivation of a Single User License for SDL Trados Studio 2015 and later
  

About known errors that can appear

• #6890 - Error message during installation of SDL License Server Manager (Safenet/Sentinel)
  
• #8340 - Network license activation error ’Provider error occured code 0 - Activation not allowed...’
  
• #8302 - Error message when using offline Single User License activation: Error[102]: A network server contacted for standalone server related information
  
• #8301 - Error message when activating your SDL Trados Studio 2015 license online: The remote name could not be resolved: https://sdl.prod.sentinelcloud.com/ems/
  
• #7412 - Error message when disconnecting from SDL Licensing Server: Error (0xC8001001) - Client handle refers to an invalid licensing system context
  

Have a nice day!