Upvote:4
You're affected by the laws of the country where you currently are. So if the country laws prohibit owning any specific flag - you'd better obey. Countries typically only care about their own flags.
However the Wikipedia article you linked to describes use of flags and that doesn't include owning the flag. Common restrictions may include:
- prohibition of burning or otherwise destroying the flag in public or demonstrating the process - that can qualify as state symbol desecration
- prohibition of using the flag or a fabric colored as a flag as clothes and especially underwear - for example pants with USA "stars-and-stripes" flag on the butt could qualify as offense
- prohibition of public display of the flag other than during state holidays and on state property - for example, you may be disallowed to display the flag on a private house because it's not a governmental institution
This applies in most cases. In case of doubt check for local regulations in advance. This Wikipedia article may be a good start.