How to avoid customer having to enter product key?

[maxXPsoft]

Question:

Simply adding $OEM$ folder into DVD\sources will make the setup copy its contents into %windir%? Or do I need some other settings from the unattended file maybe?

yes Look at Waik.chm Understanding Distribution Shares and Configuration Sets

Important:

Do not overwrite existing files carried and serviced by the operating system. Using $OEM$ to update or overwrite these files can cause the operating system to behave unexpectedly and result in serious issues.

[Octopuss]

I must confirm that

cscript %windir%\system32\slmgr.vbs -ilc %windir%\system32\OEM\lenovo.xrm-ms

cscript %windir%\system32\slmgr.vbs -ipk xxx

works like a charm.

[maxXPsoft]

I must confirm that

cscript %windir%\system32\slmgr.vbs -ilc %windir%\system32\OEM\lenovo.xrm-ms

cscript %windir%\system32\slmgr.vbs -ipk xxx

works like a charm.

Will only work for newer PC with Slic 2.1 bios. OEM typically