Again, all "as I understand it"...
monele wrote:So, if I understand this well, someone from a country without a good copyright law can take anything from the web and sell it without worrying? That sucks :/
Yes. So long as they only attempt to sell it within jurisdictions that don't have copyright treaties with the country of origin of the original work. As soon as someone from such a country tries to sell your copyrighted material in a Berne-signatory country (or a country who has signed any other similar copyright treaty with your country) then they're in violation of the laws of that country.
Thankfully, practically every major country in the world does
recognise everyone else's copyrights - according to Wikipedia-which-always-lies, the United Nations recognises (knows of and accepts the valid existence of) 193 countries, and 163
of them are Berne signatories. Those which aren't signatories to any international copyright conventions tend to be the shady and/or unfriendly-to-the-west regimes like Iraq or the DPRK, or tiny places with no population to speak of like Palau
... although it seems even my example above is out of date, since the DPRK apparently signed up to Berne in 2003.
So how it is when i want ot use images from anime?
It depends what you want to do with them.
Firstly, there are many provisions of copyright law - varying from country to country, but broadly similar - which allow you to use copyrighted material without permission. The most common is the nebulous 'fair use', which usually allows you to use a limited subset of the material for review purposes (e.g. I can write a review of One Piece
and include screenshots from the anime, even if I'm giving it a very bad review, without permission) and usually has some protection for parodies.
More commonly, though, for things like using screenshots from anime in a visual novel based on that anime, it's simply copyright infringement, and technically just as illegal as downloading MP3s from the Internet. Typically, though, copyright holders don't tend to prosecute this kind of infringement, because it will generate significant badwill amongst the fan community - usually if they don't like it they'll send you a cease and desist letter asking you [relatively] nicely to stop distribution. The safest option is to create your own graphics, or obtain some from a source which allows you to use them in games.