I have received an email from the NXP as below:
Thanks for your interest in NXP Docstore.
For a successful registration a Nondisclosure Agreement – NDA - between your company and NXP is required: please provide this if available or contact your local NXP support team for setting one up.
Thanks in advance
but how can I set up the Nondisclosure Agreement ?
See below advice, please!
--Contacting local distributor of NXP(FAE or Sales)
--Distributor helps you sign NDA with NXP
--Registering an account on "http://www.docstore.nxp.com/ "
--Applying for authority on product you want to use
--Applying corresponding documents you want.
--waiting for approval.
Have a nice day!
TIC weidong sun