License: safe to re-install OS?

Hi,

The OS is quite old and bloated on my Raspberry Pi, and I would like to re-install it by fully wiping the memory card (or maybe better getting a new one). I'm not sure which part of the hardware the license is bound to.

• Is it safe to wipe and re-install the OS (newer major version than currently installed) on the same card?
• Is it safe to also replace the memory card?
• Anything else I should know (as long as the Raspberry Pi board remains the same)?

Thanks