In app purchase validation when offline

How can I validate access to additional content downloaded via in-app purchasing when the device is offline? A user should still be able to access those resources when offline. In theory a hacker could copy an app's additional resources purchased legally, including the plist file, from one device to another and then access those resources on an offline device without a problem.
My initial thought was to encrypt with the user's apple id at purchase time, but I can't get access to it. I can't use the device id, that prevents sharing over the cloud. Just storing the transaction receipt is insufficient, that could be copied to the new device.
I know the problem would only occur for an offline device so perhaps it is not considered to be a major issue, but I would like to protect this additional content. All the examples I've seen seem to assume a device will be online.
Would a plist file copied in this way from one device to another still be work? If so, is there a recommended way to protect additional resources or am I being too paranoid?
Thanks in advance for any suggestions!

This was a bug, as the Beta certificate was never deployed to the server. I have worked to get that added and now you should be able to use the sample code, as is, and download the certificate without receiving a 404.
https://lic.apps.microsoft.com/licensing/certificateserver/?cid=A656B9B1B3AA509EEA30222E6D5E7DBDA9822DCD
Bret Bentzinger (MSFT) @awehellyeah

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I think theoretically it shouldn't work, and doesn't by the
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HT4009 I am trying to make an in app purchase but when I press buy it does not go threw and tell me to go to the apple support,

I am trying to make an in app purchase but when I press buy it does not go threw and tell me to go to the apple support.

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I shut off in app purchases but when I try to get one it still comes on and I don't want it to

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I keep getting an in app purchase error when I go to buy tokens on scramble

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In App Purchase Validation

I have created a beta app in the store, so I can query that and get product listings.
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I have several apps that I purchase in-app items from (extra lives, coins, etc...) I have one app that will only sporadically allow me to make in-app purchases. When it denies my request an error message appears advising me to contact the iTunes support store to complete the purchase. But 5 minutes later I can successfully make an in-app purchase on a different app so I know there is no issue with my payment method. How can I fix this problem?

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I am currently using a 4s and had 3gs previously. Same apple id I have always had. Settings within restrictions are ON for in app purchases. WHen I attempt a purchase the error that pops up is that it cant connect to itunes store. What am I missing?

I am having the same problem. There are 3 different apps that I have tried to make an "in app" purchase on. One of the apps tells me "Cannot connect to itunes". We know that this is not true as I have connected to it immediately before and after trying to make this purchase. The other 2 purchase that I have tried to make just don't do anything when click the "Buy now" icon.
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HT4009 Trying to make an in app purchase.

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Hi everybody
Reent.y i send this mail ( read below )
Does anybody knows? Does this sounds familliar to anybody? I am tired
Of all these small errors and technical issues with apple and their payment systems.
This is the mail, wich contIns my problem;
Good day,
I recently bought to in app purchases.
The first 2 times, went without problems using click and buy
The third app i wish to buy, gave me an error, that i need to contact itunes, to
Complete this transaction, wich is strange, because it worked before. I have enough
Money on my click and buy acount. Also is in app purchase ENABled in my system settings.
But the strange thing is, i can buy directly from the appstore, but having this poblem only
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Now i get this odd error, saying ' contact itunes, to complete this transaction'
Whats wrong?????.
Regards. Dave
Verstuurd vanaf mijn iPad

If you haven't already done so then you can contact iTunes support via this page and ask them why the message is appearing (these are user-to-user forums, we won't know which reason is causing it) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page

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Thanks! I'll try it. I didn't know you could just contact support.
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Regards.

In app purchase validation when offline

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