When you open i Tunes in Safe Mode, you isolate the program from any interference caused by plug-ins or scripts not manufactured by Apple.To start i Tunes in safe mode, hold down the Shift and Control keys on your keyboard while you open i Tunes.If your Mac has multiple partitions running different operating systems, either for dual booting OS X or for Boot Camp, you may decide you want to share the exact same i Tunes Library across those different operating systems.
It can remove DRM from both i Tunes purchased and rented videos at a 20X faster speed and convert them to unprotected MP4, AVI, MOV and etc videos so that you can backup them to hard drive, Google Drive or play them with non-Apple media players and devices. Here is M4VGear i Tunes Library backup tool for Mac.) In the DRM Removing process, all subtitles and audio tracks including 5.1 audio track will be preserved.
Since the last update, i Tunes is unusable for me on my i Mac, because with every song change it shows a "Could not connect to the i Tunes Store" error message.
My network at work does not allow access to the i Tunes store, but that is ok.
Sudden and catastrophic failings like this are normally a result of the i Tunes library file getting corrupted.
i Tunes maintains the library in two files: "i Tunes library.itl" and "i Tunes library.xml", both in /Music/i Tunes.