How to transfer one app from one ipad to another ipad?

[sfcagent86]

Hello, how can I transfer one app from one ipad to another ipad? I tried to air drop the app from one ipad to the othere ipad
but this failed because the app is no longer in the App Store.

Note, the app is no longer in the App Store however I did make a itunes backup of the ipad that contains the app that I want to transfer.

Thank you

[PHolder]

@sfcagent86

app is no longer in the App Store

It’s my understanding that each iPad has a unique ID that the install of any app is tied to. I doubt there is anything you can do if you can’t re-download it from the app store.

[big_D]

Probably only restoring the destination iPad with the backup of the source iPad, which seems a little extreme, unless it is a replacement.

[sfcagent86]

Yep I considered that but this is not a replacement ipad and I only want that one app.

[Jamze]

On the other iPad, are you able to find it in ‘My Purchases’ in the App Store app? I’ve done that before and downloaded an old app that wasn’t in the store.

It’s my understanding that each iPad has a unique ID that the install of any app is tied to.

I thought it was linked to your Apple ID, not the device?

[PHolder]

@Jamze

I thought it was linked to your Apple ID, not the device?

https://help.apple.com/pdf/security/en_US/apple-platform-security-guide.pdf This is a long and detailed document, which is likely to make pretty dry reading, but I bet their are more details in there. I’ll quote one section, which mentions the uniqueness of IDs but also claims Apple doesn’t have access to it directly… They clearly don’t want anyone to know exactly how they use the security measures.

Root Cryptographic Keys

The Secure Enclave includes a unique ID (UID) root cryptographic key. The UID is unique to each individual device and isn’t related to any other identifier on the device.

A randomly generated UID is fused into the SoC at manufacturing time. Starting with A9 SoCs, the UID is generated by the Secure Enclave TRNG during manufacturing and written to the fuses using a software process that runs entirely in the Secure Enclave. This process protects the UID from being visible outside the device during manufacturing and therefore isn’t available for access or storage by Apple or any of its suppliers.

sepOS uses the UID to protect device-specific secrets. The UID allows data to be cryptographically tied to a particular device. For example, the key hierarchy protecting the file system includes the UID, so if the internal SSD storage is physically moved from one device to another, the files are inaccessible. Other protected device-specific secrets include Face ID or Touch ID data. On a Mac, only fully internal storage linked to the AES engine receives this level of encryption. For example, neither external storage devices connected over USB nor PCIe-based storage added to the 2019 Mac Pro are encrypted in this fashion.

The Secure Enclave also has a device group ID (GID), which is common to all devices that use a given SoC (for example, all devices using the Apple A15 SoC share the same GID). The UID and GID aren’t available through Joint Test Action Group (JTAG) or other debugging interfaces.