The "iTunes COM SDK for Windows" archive from the Apple Developer Center contains files which are marked as encrypted. Shortly after extracting the files to my libraries folder, I was surprised to receive a popup dialog from Windows 7, "Encrypting File System," which prompted me to back up my encryption certificate and key:
I used CIPHER.EXE to verify that the only encrypted contents on the volume were those of the Apple download:
C:\lib>cipher /u /n Encrypted File(s) on your system: C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\.DS_Store C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\iTunesCOM.chm C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\iTunesCOMInterface.h C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\iTunesCOMInterface_i.c C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\LicenseAgreement.rtf C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\ReadMe.rtf C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\SampleScripts\.DS_Store C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\SampleScripts\CreateAlbumPlaylists.js C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\SampleScripts\RemoveDeadTracks.js C:\lib\24460_itunescomwindowssdk\iTunesCOMWindowsSDK\SampleScripts\RemoveUserPlaylists.js C:\lib\24460_itunescomwindowssdk\__MACOSX\._iTunesCOMWindowsSDK C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._.DS_Store C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._iTunesCOM.chm C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._iTunesCOMInterface.h C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._iTunesCOMInterface_i.c C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._LicenseAgreement.rtf C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._ReadMe.rtf C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\._SampleScripts C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\SampleScripts\._.DS_Store C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\SampleScripts\._CreateAlbumPlaylists.js C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\SampleScripts\._RemoveDeadTracks.js C:\lib\24460_itunescomwindowssdk\__MACOSX\iTunesCOMWindowsSDK\SampleScripts\._RemoveUserPlaylists.js
To fix this, I opened the properties for the iTunesCOMWindowsSDK folder, selected the General tab, clicked Advanced, and unselected "Encrypt contents to secure data":
