Technical/Legal question about modifiying downloaded project

I know that I can pay for for enabling “Export for self-hosting” but one I’ve exported/downloaded it… Can I modify that code? Can I update the assets?

Is that something I can do from a technical POV (I can read/modify the code) and is that something that I can do from a legal POV? (licenses and so)

Thank you in advance.

Yes and yes.

Yes and yes (at least as far as the engine code (as it’s under MIT license) and the assets/code that you own/done yourself). The only part I’m not sure is the removal of the PlayCanvas loading screen if you don’t have an organisation account.