As noted above, you need the license from the national organization where you live.
For example, I live in the US and have a USPA license. I can take that license and visit other places and jump. As another example, Canadians with CSPA licenses can come to the US and jump on those.
You seem to be from Germany. I don't know what organization oversees Germany, but you'll need a license from them if you live there.
If you go to, say, Spain (where the weather is really nice and they have some great DZs and excellent instructors), you'll get a license from them.
You would then go home and work with a local DZ to get a license from your national organization.
Typically, converting a license from one organization to another is mostly paperwork.
I would talk to your local DZ to find out what they would require to convert the license from somewhere else.