Here is some general information to help you get started.
We'd be delighted to add more countries to this table! Please post the information on the forums, giving links to the applicable regulations and information on what it all means. Also, please point out any inaccuracies in the existing table.
Note that the above table is for most users without any special license. If you are have an application specific license or have a HAM license then you should know what rules are applicable to you.
Finally, compliance is your responsibility. The 3DR radio is a 'DIY' radio part and you need to ensure what whatever you build meets local regulations. Please check your local rules carefully.
The following table may be helpful matching your local radio regulations to the two radio models available