Database Info

Marketplace "copy protection" cracked

I will not do anything with this, or publish how. But you can be assured the "warez" guys from that one site will figure this out within a day or so as well...
As most of you will know I am a software developer by trade, with some commercial offerings from my company.
And then there was Marketplace. For commercial devs, something nice to have. But if you have followed the news, the piracy protection for commercial developers is not much to speak of. See this document http://download.microsoft.com/downl...tplace for Mobile Anti-Piracy White Paper.pdf.
I will refrain from quoting the obvious mistakes in this document, if you give this thing a read, you will notice them soon enough. What it all comes down to is that there is no copy protection, not even at the advanced level, at least if they implement it in the way I interpret from reading that document.
So today I started up Marketplace and it worked. Hurrah. The current level of protection is making sure the CAB files are deleted upon install - which is obviously not a way to protect anything - but even this, I thought, should easily be circumventable.
Now, because I wanted to see how fast it could be done, I went with a hunch instead of doing any investigation. And that hunch worked like charm. It took me less than five minutes to circumvent this "protection", and get the ability to save the CABs the MarketPlace app downloads to a different folder. As the CAB file is the same for every downloader, you could just give this CAB you payed for out to all your friends.
Obviously I will not disclose the method, because that would be working against other commercial developers, and ultimately myself. It's just to let you know how ridiculously easy it is, and to give fair warning to those looking to sell apps on the Marketplace.
So, the moral of the story is... WTF MICROSOFT?
I know firsthand there is no such thing as perfect copy protection, but this is just plain ridiculous.
What we really need is for apps to be able to use our own copy protection schemes... you know, like the good web-based app stores out there.
EDIT: l3v5y has also succeeded in doing something similar, and it seems the WMPowerUser admin also found another easy way to do it... Yay, and it ain't even out yet!

Not even 12 hours after launch...that's pretty quick

Oh noes.... that's not good!
Imagine Microsoft reads this and decides to offset tomorrow's Marketplace launch...
Or even worse, Microsoft launches the Marketplace but developers decide not to submit their apps because they're concerned that their apps get pirated.

Thats what happens when devices aren't locked down.

That sounds bad, but it's really no different to how things are today. Perhaps there are some apps that have more security than either nothing or a serial key, but none that I use have anything more sophisticated.
Even as a developer myself, I'd easily take this over some DRMfest.

So, if I'm reading this correctly, when you buy something from marketplace it's not tied into your username with a password like most apps? Instead, you just buy it and it installs the app, but doesn't give you a cab? Yeah, I don't think it's that hard to work around that and get a cab for yourself. Some of the cheaper apps at Handango are like that. Can you re-download an app onto a new device or if you have to hard reset, and is it free or do you need to buy download protection like form Handango?

Good, copy protection pisses me off, all it does is piss of the genuine users. We have to deal with codes and activation to be legit, while people getting it free, just click here and there, copy a code here and huzah.
Copy protection doesnt work, someone will always find a way around it. Unless its linked to a windows live profile/xbox live profile. Which I can see probably happening when they bring out Zune on mobile phones, which sounds like it might be sooner rather than later!

I did something like this earlier... MS haven't quite got security done yet, though my guess is the iPhone is no better...

I'm really surprised by the lack of any drm; what's the point of signing in w/ one's Windows Live account? The easiest thing to do is to associate valid applications w/ one's Window's Live account. That's what itunes does for music at least (I don't know about apps as I don't have an iphone/ipod touch). Of course, what would happen is that an internet connection of some form is needed when the application is first installed, which could become inconvenient.

The truth of the matter is that the percentage or ratio of people who would bother to do this is pretty small. Most WinMo usersbarely even know how to setup e-mail not to mention install a cab file.
Most of the people in this forum already know how and where to get cracked apps or warez if they wanted too. I don't see this so called "flaw" as being an issue to MS or developers.

Must admit that I find it a bit worrying that your not able to make a backup of the applications you buy by taking a copy of the cab file somewhere safe.
After having sent back 4 HTC phones (two different models) in the last 10 months, and having an SD die on me I'd really like to know that I have a backup of anything I've paid for.
Can anyone confirm if its possible to reinstall something you've paid for through the Marketplace app if it gets removed from your phone, or you get another phone? ie if you log into Marketplace with the same Lice ID does it show apps that you've bought but which aren't on the phone your connected with?
If I look at an app that I have installed through Marketplace there is no install button anymore and Marketplace tells me that it is installed... so no obvious way to get the application back...
Not enough free apps on the UK store for me to mess about with really (have installed Shazam trial but don't want to risk uninstaling it just to see what happens).
-FM

fatmonk said:
Must admit that I find it a bit worrying that your not able to make a backup of the applications you buy by taking a copy of the cab file somewhere safe.
After having sent back 4 HTC phones (two different models) in the last 10 months, and having an SD die on me I'd really like to know that I have a backup of anything I've paid for.
Can anyone confirm if its possible to reinstall something you've paid for through the Marketplace app if it gets removed from your phone, or you get another phone? ie if you log into Marketplace with the same Lice ID does it show apps that you've bought but which aren't on the phone your connected with?
If I look at an app that I have installed through Marketplace there is no install button anymore and Marketplace tells me that it is installed... so no obvious way to get the application back...
Not enough free apps on the UK store for me to mess about with really (have installed Shazam trial but don't want to risk uninstaling it just to see what happens).
-FM
Click to expand...
Click to collapse
looks like it keeps track of all apps you purchased.

ow well, I guess it's a matter of time when there will be sites that point to all the cabs available on upload sites and stuff. Just like those sites exists for iphone/ipod (appulo.us for example)
I guess that's what happens when people see that there a lot of apps available on other country stores..
what do you think...

double post

thedicemaster said:
looks like it keeps track of all apps you purchased.
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Click to collapse
Hi dicemaster,
How did you try this? Uninstalling and reinstalling on the same phone or another phone? Or the same phone after a hard reboot / content erase?
I'm just interested to know from what state you can get back to your purchased applicationsand whether is purely your windows live id that connects you to your purchases or if there is some device specific stuff checked as well.
Cheers,
FM

Is there anything to stop Software Authors implementing (or continuing to use) their normal Serial number protection systems?
Looking at the Market Place, there are obviously some of the Big Names we all know and love, and I don't see why they would remove protection systems they have in place already, unless it was a MarketPlace requirement.
Personally, I can't say I'm at all impressed with the MarketPlace implementation - it heralds back to the early days of PocketPC. Maybe they're going for lowest common denominator hardware support, but frankly even the relatively poor Android marketplace on Hero is massively better. And the Appstore even more so. And I think Cydia tops most of them!
Let's hope that the MarketPlace at least drives prices down.
V

I am assuming it's more difficult then just going to \Windows\AppMgr\Install folder while the installer is running and copy the CAB file to another location. This is how I get the CAB files from PC only installers.
I personally use SKTracker a lot. I take a snapshot before, and then during the install and see what has changed. That generally tells me right where any install files/CABs are that I need to grab.

vijay555 said:
Is there anything to stop Software Authors implementing (or continuing to use) their normal Serial number protection systems?
Looking at the Market Place, there are obviously some of the Big Names we all know and love, and I don't see why they would remove protection systems they have in place already, unless it was a MarketPlace requirement.
Personally, I can't say I'm at all impressed with the MarketPlace implementation - it heralds back to the early days of PocketPC. Maybe they're going for lowest common denominator hardware support, but frankly even the relatively poor Android marketplace on Hero is massively better. And the Appstore even more so. And I think Cydia tops most of them!
Let's hope that the MarketPlace at least drives prices down.
V
Click to expand...
Click to collapse
Microsoft does not support your own serial systems. There is no information you can compare runtime vs purchases either, so you can't roll your own. Well ok, you DO actually have device ID information you could use, but that way purchasers can only run the application on the phone they actually bought it on. It is not clear how 're-download' information will be transmitted. If that also transmits a device id, then it is possible to roll your own, though it would be pretty nasty.

zim2323 said:
I am assuming it's more difficult then just going to \Windows\AppMgr\Install folder while the installer is running and copy the CAB file to another location. This is how I get the CAB files from PC only installers.
I personally use SKTracker a lot. I take a snapshot before, and then during the install and see what has changed. That generally tells me right where any install files/CABs are that I need to grab.
Click to expand...
Click to collapse
If you go to C:\Program Files\Microsoft ActiveSync on your PC, you'll probably find an archive of many things that you installed over active sync.
SK Tools is a good way to re-pack any installed programs into cabs. I would guess that it works with programs from Market Place.

good find bud..i sent it to engadget for ya
http://www.engadget.com/2009/10/08/dev-finds-windows-marketplace-drm-severely-lacking-easily-circu/

Good News for Developers, Bad News for Pirates!!

http://www.engadget.com/2010/07/28/new-licensing-service-replacing-existing-copy-protection-metho/
Looks like pretty soon the days of people copy and pasting apk's all over the place are coming to an end.
I hope this doesn't make theming harder.. We'll see.
From reading that article,
Seems like airplane mode or a firewall would crush all the hopes and dreams of google and app devs.
It seems that every time we open an app it needs to verify that it's been paid for by contacting a "licensing" server and retrieving a response.
I feel like that could slow down launch times, and being unable to use an app when offline would be like UBISOFT hell all over again.
I really hope google puts a lot of thought into this..

I wonder if this if already being done? Every time I try to play that golf game on my EVO on an airplane while the radios are off I get a FC when it starts. As soon as I an on the ground and turn the radios on the game works fine.
Sent from my PC36100 using XDA App

what if you are in an area with no signal or on a plane or something? you cant open any apps???

This is already in place in a number of apps, one is IP Cam Viewer.
I paid the money for it. I transferred all my files to my wife's Evo 4G, and thought "hell I'll see if it works..." Well it didn't. When I try to open the app, it tells me that I have to purchase it from the marketplace.
I'm all for buying apps when they're good, and I understand single user licensing. Guess I was just hoping I wouldn't have to spend double the money for all the apps I use.

simplyphp said:
This is already in place in a number of apps, one is IP Cam Viewer.
I paid the money for it. I transferred all my files to my wife's Evo 4G, and thought "hell I'll see if it works..." Well it didn't. When I try to open the app, it tells me that I have to purchase it from the marketplace.
I'm all for buying apps when they're good, and I understand single user licensing. Guess I was just hoping I wouldn't have to spend double the money for all the apps I use.
Click to expand...
Click to collapse
I've heard of couples sharing the same email as apps get replicated on the two phone

I can confirm that they don't get replicated..
I have two evo's right now under the same email and they're definitely not replicating crap.

cahiatt said:
I wonder if this if already being done? Every time I try to play that golf game on my EVO on an airplane while the radios are off I get a FC when it starts. As soon as I an on the ground and turn the radios on the game works fine.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Now that's a problem I understand about paying for apps but not working when I'm in a place with no signal. I see a law suit brewing up. I paid for the app I should be able to use the app whenever I want to. Class action law suit coming real soon.
Sent from my PC36100 using Tapatalk

Crap....
"A limitation of copy protection is that applications using it can be installed only on compatible devices that provide a secure internal storage environment. For example, a copy-protected application cannot be downloaded from Market to a device that provides root access"
...Seriously???
EDIT - the above quote was misrepresented in the place I copied from...research shows it to be misleading. the actual bit of Google's text is posted over on page to of this thread. disregard my indignation in this post...

This is discouraging, because a lot of people like to try the full before they buy it expecting more than what full has to offer, only to be disappointed later.

willwgp said:
This is discouraging, because a lot of people like to try the full before they buy it expecting more than what full has to offer, only to be disappointed later.
Click to expand...
Click to collapse
You do get a 24 hour refund option when you buy from the market so I'm not worried about trying before you buy. I do worry about not being able to play something when I'm in the bathroom at work because I don't get a signal there.

well how many ppl do actually piracy apps??? oh my bad forgot that this is Android, for a second i though it was apple!!

Just to clarify a couple of things:
There are 2 ways to use the Licensing - one is Strict - you CAN NOT USE THE APP WITHOUT ACCESS TO MARKETPLACE. Personally, screw that.
Option 2, however, is a non-strict policy. Server managed, where the license is 'cached' to storage. You also can programmatically set how long your app can be used without any license check.
That'd be the way i go

josue85 said:
You do get a 24 hour refund option when you buy from the market so I'm not worried about trying before you buy. I do worry about not being able to play something when I'm in the bathroom at work because I don't get a signal there.
Click to expand...
Click to collapse
That'll be up to the developer. I like this approach, as I'd be happy to do say... a 5-7 day turn around on the license check. After 7 days with no data signal, seriously, where the hell are you? LOL
Besides, if you've used a paid app for 7 days, and by that time can't decide if you need it or not - wow.
And of course, as soon as you got signal again, the license check would go through and you can use the app again, no problem.
I'm sure there will be UbiSoft and EA style implementations though - way too damn draconian for my tastes. I don't care to know every single second that someone's using my app. I would just like to know that they haven't 'copied that floppy' as it were LOL
I have no doubts this will be defeated in time, though. All it would really take is mimicking the server license response, which can be extracted from the locally cached license of an actual paid product.
People that pirate software are going to do it, regardless. Don't make the honest people pay the price of draconian DRM.
The best approach I can make as a developer, is give my customers the features they want, in a stable, good performing package, and discourage 'casual' piracy. Beyond that, it's out of the developer's control, and honestly, any more than that usually just pisses off the customer and annoys the pirates for about a day and a half.

Ok...had to read the SDK paperwork as I really wanted to know this...my previous post was incorrect and here is the update...
From Google:
Android Market Licensing is a flexible, secure mechanism for controlling access to your applications. It effectively replaces the copy-protection mechanism offered on Android Market and gives you wider distribution potential for your applications.
A limitation of the legacy copy-protection mechanism on Android Market is that applications using it can be installed only on compatible devices that provide a secure internal storage environment. For example, an application using the copy-protection mechanism cannot be downloaded from Market to a device that provides root access, and the application cannot be installed to a device's SD card.
With Android Market licensing, you can move to a license-based model in which access is not bound to the characteristics of the host device, but to your publisher account on Android Market and the licensing policy that you define. Your application can be installed and controlled on any compatible device on any storage, including SD card.
Click to expand...
Click to collapse
Also...there are options for the Devs to allow for apps to be used a chosen number of times before they need to check in for licenses. Strict has to check in every time....other option allows dev to choose based on times used or time since last check in.
SO...all in all I am much less worried about this now.

topdnbass said:
I can confirm that they don't get replicated..
I have two evo's right now under the same email and they're definitely not replicating crap.
Click to expand...
Click to collapse
With licensing the dev can choose whether an app can be accessed from different phones. It is an option...
(greeked...multiple times)

Question: Does that mean we won't be able to open, modify, and resign apks? Like...to change the appearance (make a widget clear, etc).

More like bad news for paying consumers. That's who always pays for everything. Those of us who actually buy the products.
I plan on speaking with my wallet. I wont buy any app that requires I have an internet connection.

A limitation of the legacy copy-protection mechanism on Android Market is that applications using it can be installed only on compatible devices that provide a secure internal storage environment. For example, an application using the copy-protection mechanism cannot be downloaded from Market to a device that provides root access, and the application cannot be installed to a device's SD card.
Click to expand...
Click to collapse
Wait so according to google us rooted folk couldn't download copy-protected apps before now?
Urrr, i think im missing something

This is actually a nice implementation for both the software developer and the user. Most will implement this where it only has to check-in every week or two. So the odds of getting caught in a spot where there is no connection is low.
At the end of the day, it is a pretty straightforward way to handle copy protection that really shouldn't inconvenience anyone.
Also it will bring more developers to the platform if they know they don't have to worry as much about piracy.

Piracy will still run rampant. People will find ways to circumvent this, that's just how it is. At least it will curb some piracy since copying and pasting an apk file wasn't much of a deterrent.

Samsung Apps updated

I just noticed that Samsung's market finally had more than just two apps in it. This is for the uk, and they look pretty uk specific, but the new apps that just appeared are:
Sky News
Investment week
WH Smith eBooks
(the pre-existing apps were radio companion and blinkx beat)
Just what the Tab needed: another eBook reader. As though we didn't have enough already (and I note that the install screen says it doesn't [yet] sync if you already have a web account).
Any interesting apps in other countries?
Sent from my GT-P1000 using XDA App

Nope, just an app from a german news television named n-tv. Actually there are four apps in appstore.

hello...my Apps
AppRemover (UnInstaller)
Astro (Explorer)
Dolphin Browser HD (Browser)
TuneIn Radio (4 Austria)
Unrar
FlashPlayer
Facebook
Flikie Wallpapers HD
Applanet
Beautiful Widgets (Weather App)
Better Alarmclock Pro
greetinx Cloon

kupuguy said:
Any interesting apps in other countries?
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
Its dead for Russia with only one app for Russia - blinkx Beat.

kupuguy said:
I just noticed that Samsung's market finally had more than just two apps in it. This is for the uk, and they look pretty uk specific, but the new apps that just appeared are:
Sky News
Investment week
WH Smith eBooks
(the pre-existing apps were radio companion and blinkx beat)
Just what the Tab needed: another eBook reader. As though we didn't have enough already (and I note that the install screen says it doesn't [yet] sync if you already have a web account).
Any interesting apps in other countries?
Sent from my GT-P1000 using XDA App
Click to expand...
Click to collapse
I have my Tab with a Voda SIM in it in UK and all I see is the Companion Radio.
The first day I got my tab, I'm sure I recall there being 2 or 3 other apps, but I was having a serious problem with something and had to hard reset. They never showed up since.

I've installed a couple of the new apps:
The WHSmith app looks pretty enough but it wants me to register to buy a book even if the book I want to buy is 'discounted' by 100% so I haven't yet bothered. A random sample of one book (I shall wear midnight) is £12.61 as a WHSmith eBook, $12.80 Amazon.com Kindle, £8.09 amazon.co.uk Kindle so it doesn't look too promising.
The Sky News app might actually be useful: text stories, most with click through to a (low resolution) video. There's also an option to read the stories out loud though some of the speech synthesis is a bit wayward. One obvious bug is that they've used a font which displays the unicode fallback diamond character instead of a pound sign which for a supposedly UK app with a 'business news' section shows a remarkable lack of testing. Also I'd really like a technology section and the option to turn off 'showbiz'.
One feature I haven't seen elsewhere is the 'Your Report' section that you can use to upload stories to Sky. However they don't get many points for telling me to refer to terms and conditions at skynews.com without actually providing any links.

Is it possible to change the country of samsung apps ? Because i bought my tab on amazon.de but i live in France and i would like to buy or download apps that are available in france.

I think it depends on the SIM

i have a french sim but no french apps...

Seeing as how the SamsungApps app won't even start without a SIM present, it suggests it's checking the locale of the SIM to see what apps are available to the region. I've got nothing whatsoever in mine, presumably since the Tab isn't available in New Zealand.

Yes you can change it. Open the dialer and type in the code:
*#272*YOURIMEI#
Put your IMEI number where it says YOURIMEI and it will allow you to switch country codes. If you change the country code you will lose your stuff. It will be like a system restore so make sure you backup your stuff.
Sent from my GT-P1000 using Tapatalk

1- Financial Times
2- Visit London Blog
3- Sky news
4- Investment week
5- WHSmith eBooks
6- Blinkx Beat
7- Radio companion
#2 it maybe interesting if it shows events and things going on in London, #-3 I may try (but anything from Rupert Murdoch mouth is not to be trusted)
#7 does not appear the list any more (I installed it just to try it)
Did I mention I hate Rupert Murdoch?,

PBL1 said:
1- Financial Times
2- Visit London Blog
3- Sky news
4- Investment week
5- WHSmith eBooks
6- Blinkx Beat
7- Radio companion
#2 it maybe interesting if it shows events and things going on in London, #-3 I may try (but anything from Rupert Murdoch mouth is not to be trusted)
#7 does not appear the list any more (I installed it just to try it)
Did I mention I hate Rupert Murdoch?,
Click to expand...
Click to collapse
Yes, bizarrely once you install something it disappears from the list which makes it very confusing. I had another look at the "Sky News" app last night and noticed that all of the sports stories were from November 7th: they've updated them now but it was a bit bizarre seeing their headlines were about F1.

ayman07 said:
Yes you can change it. Open the dialer and type in the code:
*#272*YOURIMEI#
If you change the country code you will lose your stuff. It will be like a system restore so make sure you backup your stuff.
Sent from my GT-P1000 using Tapatalk
Click to expand...
Click to collapse
doesnt let the sales code change. no keyboard even. and mine is on SER. how did you do that, mate?

Router said:
doesnt let the sales code change. no keyboard even. and mine is on SER. how did you do that, mate?
Click to expand...
Click to collapse
You don't need a keyboard. Once you do that you can select a different code.
Sent from my GT-P1000 using Tapatalk

There's an app for rooted phones that allows you to change your country so that you see more options in the market.
I used it for EVO, I'll have to to look for it after i wake up a little more but anyone impatient can search the htc supersonic (aka Evo) forums to find it.

My Samsung Tab (VF Germany SIM) now shows 5 Apps including Asphalt 5 HD as a download which I'm doing at the mo. That wasn't shown yesterday.

zwuncki said:
My Samsung Tab (VF Germany SIM) now shows 5 Apps including Asphalt 5 HD as a download which I'm doing at the mo. That wasn't shown yesterday.
Click to expand...
Click to collapse
Showing now for me too.
Seems to be the full version, must be annoying for those people that may have previously bought it!

I think there must be something firware dependent that controls what apps are visible because I had a few Apps on my UK Tab until I upgraded via samfirmware.com to JK5 and now I don't have anything in there but the radio companion.
Anybody else in the UK using a Voda sim and can confirm whether or not any other apps are visible?

Mines got a UK orange sim in it, do they filter it by network too or just location..?

the missing xap/application

this has happened before on my hd7 and i would hard reset it, and now its happened to my titan, my at&t wireless account app has disappeared after i updated it from the marketplace, it does not show up in my hub list, yet when I go to the market to reinstall it all it does is say "share" meaning that i already have it installed but it isnt visible for me to access.
does anyone know how to bring back this ghost application to my hub list?

I have a similar problem on my Mozart too, I installed a .XAP game (please don't stake me), but it didn't appear anywhere on my phone. Now it's taking up space and the marketplace says I already have it installed on my device. I also tried redeploying the .xap. It installs and everything's fine, but I still can't find it anywhere.

Oh em gee I found my app, it was renamed myAT&T , no longer under the As but under the Ms durrrr!
Sent from my TITAN X310e using XDA Windows Phone 7 App

I'm still having the problem, can't find them anywhere.

You know, I'd be way more inclined to help you if you'd just bothered to actually pay for the game. Piracy is pretty much a forbidden subject here on XDA, and you're not going to get much respect if you come here asking for help with it.

I'd bother paying for the games if I actually could you know, but since there's no Zune Marketplace in my country I can't. Piracy isn't the reason I'm coming here for help. It's just a .xap problem that could be from an application from any source.

I thought you said you were able to check the marketplace, and it said it was already installed? I know there used to be countries where WP7 was available but Marketplace wasn't, but I thought that got fixed with Mango.
Argh.. I'll give you the benefit of a doubt and hope you're more legit than you sound ("don't stake me"? Really?). Check the Xbox Live app, otherwise known as the Games hub. I keep mine pinned to my Start screen for easy access.

I can use the marketplace, just when it comes to billing for my UK account it requires a UK credit card and I don't have a thing like that. Virtual credit cards and etc. don't work. Anyways. It's nowhere to be found in the games hub or the applications. If I try to download the trial it gets halfway and says 'Attention required' with error code 8103010d, which, according to Microsoft's forums hasn't been resolved yet. I don't want to have it as much as I want to delete it right now.

[Q] Apps in defferent Marketplace regions

Hello.
I decided to give WP7 one more try. I tried it before Mango was relased. I live in Danmark and I noticed that there are not so many interesting apps in Danish Marketplace. So i wanted to ask if there are other apps in other Marketplace regions e.g. if i change the region to US will there be more avaible apps? If yes which Marketplace region has most apps?
Regards
okeyus

okeyus, that is just a matter of time. Same thing about the brazilian marketplace, which had nothing worthy when introduced but is now growing steadily.
In the meantime you can create a "foreign" Live ID, ie, another one which is set up to some other region, such as USA. You'll have to hard reset your phone to change your primary ID (the first ID set up on your phone controls which marketplace you'll access). After that you can add your main ID to retrieve your contacts, email, etc.
The only drawback with this method is that you can't buy anything - the country is pre-selected whenever you're going to add your credit card details and can't be changed; if you proceed, the purchase will fail because the card info won't match. You can, however, download any free or trial apps you want.

I know that. I have an US account which I created when I installed WP7 for the first time. But now i wanted to check how does Marketplace looks in Danmark and i didn't know if it's worth to switch to the US region again. I installed some apps, customized WP7 and just didn't wanted to do it again if Marketplace would be the same for US as for DK. So you are saying that at this moment there are most apps in the US Marketplace?
The other drawback is that I will not be able to use Messenger in the Messaging tab if i chose my US account. I read that the included Messenger in the Messaging tab is only for your main account. So if i have my MSN on my Danish account and I will use US account as primary one I will not be able to use that MSN tab from Danish account. (Pretty confusing but i didn't know how to explain that)

You can download an app called "Local Market Search", which will let you see the apps in other marketplaces. You won't, however, be able to download an app which is not available for your current marketplace.
The US marketplace was the first one so, yes, I believe it is the one that has the most apps. However, that is just a matter of time, as I believe there is no incentive for a developer to not sell their apps on more marketplaces.

Just did it and i must say that I'm impressed. There are a lot more apps. Im gonna stay on WP7 now. I didn't knew that there is so big difference between WP7 and WP7 Mango. It's just so much better and more user friendly now. I'm very impressed.
Anyway big thanks for the advice!

I'm not sure... Have you updated to Mango or not? If not, then you should immediately or as soon as possible Lots of new features. Plus there's another update in the works (Tango, I believe). It'll get better every time.

Yes, I am on Mango. That's what i said. I have tried WP7 before Mango was relased and i didn't liked it. But now with all the Mango features it's just awesome and fits me perfectly. That's why i said that I will stay on Mango. But i like games from Android and have only 4GB card so i just ordered 16GB class 10 card so I can use WP7 daily and Android with lots of games when i need it