How do I stop anyone changing theme or language

[jayos]

Themes can be changed by typing ?theme=classic after the url in an explorer window how can I stop this as anybody could just change my theme etc

[Joachim Müller]

delete all subfolder within the theme folder except the one you're actually using.
Same thing goes for the languages: delete all language files except the ones you're using (or want your users to use).

GauGau

[Nibbler]

When they do that it only affects how the gallery looks for them, it will remain as you defined for everyone else.

[jayos]

Thanks for the help guys