SDK license information

This file documents the existing source package's licensing metadata. It does
not create an open-source license or grant additional rights. The existing
Python/PHP/JavaScript metadata identifies proprietary licensing; the C# project
does not declare a separate package license. Use and redistribution are governed
by the applicable agreement with KDPika. Contact hi@kdpika.com for the terms
that apply to your integration or redistribution. No public registry release,
public repository or general redistribution grant is asserted by this file.
