M4A to MP3 and Itunes Plus

Good day,

I know when buying the iTunes Plus M4A songs, you can burn them to any number of CDs and use them on any Apple Device or Windows PC that you own.

Firstly. Am I right i assuming this?

Secondly. If I convert these files to MP3s using iTunes, because my car's MP3 player cannot play M4As, can I still burn those to CDs, or does the "iTunes Plus Benefit" fall away when the file is converted?

Regards,
Willem Voigt