ENGLISH MAGS ARE BREAKING THE LAW
A significant number of English language magazines being published in Thailand are breaking the law.
An amendment to the kingdom's Publishing Act introduced after the September 2006 coup stated that all publications produced in Thailand must have a Thai national listed as an editor. Publications, in this sense, include newspapers and magazines, and that act remains in force today. There is no difference whether you're a paid-for or free copy publication, the law still applies.
Like most things in Thailand there are ways around this. You can have a Thai as an editor but there's nothing stopping you having a foreign Editor in Chief or Managing Editor.
I can think of at least ten English magazines that are technically breaking this law right now - and it's criminal law so possible penalties include jail, although I am not aware of any incidents where cases have been brought against publishers for a breach of this law.

