Board Thread:Support Requests - Getting Started/@comment-10887455-20171019213712/@comment-168424-20171020183210

You are allowed to copy templates (navboxes or others) from most other Fandom wikis based on the Creative Commons licensing that is the default for a vast majority of wikis, however, it is polite and good practice to credit the wiki where you got it and ask permission, if you want to be really nice.

It helps to get permission, because the source wiki is likely to have user who know best how the template works and are more likely to help with problems or fix bugs.