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TrustZone - Trusted application development questions

I want to develop a trusted application running on the TEE/TrustZone that is embedded in Android Devices.

I contacted a TEE provider and enquired about joining the developer program and getting there SDK.

However the cost is tens of thousands of Euros to join, which is prohibitively expensive for your average android developer.

Is it possible to develop TEE trusted apps without the huge expense?

Is it possible to use "factory built in " trusted apps already in the TEE?

many thanks

Lee