How to skip the installation key step in Win8

The specific operation is as follows:
1, download Win8/Win8.1 MSDN original system
2, for example, using the popular U disk installation, making a U disk system boot disk.

3. Use Notepad to create a new empty text and rename it to ei.cfg. Note: The suffix is ​​cfg

Note:
1, [EditionID]: Version Name
For example: the retail version of Win8/Win8.1 system includes Professional, Core two versions (others also include ProfessionalWMC, Enterprise)
2, [Channel]: channel,
For example: Retail, Volume Authorization (Volume ), OEM (OEM)
3, [VL]: Whether it is a batch version, optional value 0 or 1)
For example: 0 for retail retail version, 1 for Volume volume licensing version
For example, ordinary Users download the retail version of Win8/Win8.1 MSDN system, you can enter the following command:
[EditionID]
[Channel]
Retail
[VL]
0
4, then Copy the ei.cfg file to the U disk boot disk X:sources directory (X: represents the U disk drive letter)

5. Finally, during the system installation process, we can skip the installation key input directly. Link