Not the source code, but they can see and patch the binary. And I think it takes more than just jailbreaking, but the way people pirate your program involves dumping the decoded binary that is running in memory.
If you read the tutorials on Pirate protection on this board, you'll see that pirates will often look at the raw code, and patch out parts to skip code. I'm pretty sure they will also be able to see any string constants you declare in your code.
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