This is my question, how can I protect my software from upload?
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If you're talking about protecting the software you've written for the AVR, the answer is simple: lock bits. If you don't want anyone to be able to read back your program, then program both lock bits ('0'). Nobody will be able to access your software.
Please see your datasheet on this topic for more info.
Morten, AVR tech. support, Atmel FAE
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