Can I play VO from different locations and platforms? My home computer is a Mac, I use it during weekdays. On sundays, I'm with my mum and she has a PC notebook. Am I allowed to continue playing VO on her notebook with my account, or will I get into trouble?

Life's no fun without risks. :P
But if you see a red dot move across your wall you better duck!

Yes, you can. Simply login, click the download link, and download the appropriate OS client.

THAR BE NO LIMITS!

yup the only limit is that you can not have the same account online at the same time, but you can definitely move around to different locations with your same account at different times.

Though you will notice some minor issues, because a good portion of your character data is stored locally: predefined ship setups, mission logs, mission notes etc

But you can carry corresponding files of course

And most importantly, your binds.