It doesn't where you register your domain since you just point it at your host server that being in this case Dreamhost. You should concern yourself to much a but the laws of registering domains if its Top Level Domain such as .COM if its a .se then it should be fine as this is meant for people in Sweden ETC.

I personally haven't used Dreamhost but I've used many other hosts and normally what you look for is a reputable host with lots of RAVES rather than rants so use Google to your advantage and see what people got to say about then. Furthermore you should factor in your audience. If you plan to target people living in Sweden then you should use a host in Sweden since the information from your site to your visitors will be faster since if the hosting is in the US then the Data is having to travel further and ultimately this will slow down for your target region. If your Target is EU then pick servers in EU and if its world wide then US hosting should do the job.

In regards of using copied write material you have to seek permission from the Copyright Holders, IE if its Matrix Soundtrack, Cover-art, Trailers you need to seek permission from Warner Brothers, its not as simple as you just take it down when asked because you can still be liable after, furthermore it can damage your Ranking's with DMCA take downs. Sadly its not as simple as you PROMOTING their products as they don't care and they charge licensing fees even if your doing them a favor, so depending on what you host on your site step carefully, and furthermore and finally on this topic is that your in breach of breaking the rules of DREAMHOST they can take down your entire website and tell you to find a new host.

If you obtained a free domain while purchasing hosting then you need to check the terms and conditions of purchasing web-hosting and obtaining a free domain. If you buy the domain separately you are the OWNER of this, furthermore be-careful not to include trademarks and company names for example you can't own warnerbrothermovies.com or Ilovefacebook.com since thats trade marked. If you did register such a domain you'd soon loose it.

The content you upload is ownership of whoever made the content, and people can't copy/use/change it unless you give them permission this includes text, thought it take a lot of effort to get people not copy and pasting your content.

This question is suitable here since its related to being a webmaster, or least I strongly believe it is.

It doesn't matter where you register your domain since you just point the domain to your host server (In this Case DreamHost). You shouldn't concern yourself to much a about the laws of registering domains - if it's a Top Level Domain such as .COM, in the event it's an .se domain then it should be fine as you live in Sweden.

I personally haven't used Dreamhost but I've used many other hosts and normally what I look for is a reputable host with lots of RAVES rather than rants. Use Google to your advantage and see what people got to say about Dreamhost rather than going though a trial basis. 

Furthermore you should factor in your audience. If you plan to target people living in Sweden then you should use a host in Sweden, otherwise the data is having to travel further and ultimately this will slow down the user experience for your target region.

In regards of using copyrighted material you should always seek permission from the Copyright Holders, i.e if its an Matrix Soundtrack or Trailer you need to seek permission from Warner Brothers.

Sadly it's not just a matter of taking it down once you receive a complaint, or DMCA take down order - you can still be liable for damages. It's also worth noting it can damage your Search Engine Ranking's if the search engine receives the take down order which nowadays is more regular.

They don't care about you promoting their product they care about making DIRECT money and a lot of copyrighted material found on networks such as iMDB they have obtained permission or a license to do so... for examples trailers. Lucky enough you have things like YouTube which you can embed on your site and then though advertising they receive their license fee - so to speak.

If you obtained a free domain while purchasing a web hosting package then you need to check the terms and conditions as canceling the order may permit them to keep the domain. If you buy the domain separately you are the OWNER of this, furthermore be-careful not to include trademarks and company names within the domain name... for example you can't own warnerbrothermovies.com or Ilovefacebook.com since these would infringe on trademarks and most likely ICANN or alternative domain handler will remove the domain from the DNS records.

The content that you upload and assuming it was created by yourself remains your ownership and no one is allowed to copy/use/change it unless you give them permission. This includes various media types such as videos and pictures but! also TEXT content.

The question you've asked on PRO webmasters is suitable as its related to running a site of your own and its sensible to ask ahead before doing so. GL ;)