What is a safe and easy way to preserve your iTunes library (and all related DRM) when upgrading from Windows XP to Windows 7?

[Yusuf]

Hello everyone, I'd like to ask you a problem that has been bothering me for a long time, what is a safe and easy way to preserve your itunes library (and all related drm) when upgrading from windows xp to windows 7? Thank you very much for kindly helping me !!! Cordially.