rank your "uncrackable" software protection

[mcp]

Depends on the time and resources only. They are secure enough from the current point of view. BTW, for practical reasons RSA le 512 is insecure. AES is also not secure in some cases, including pure WBAES.

Sure, but his general statement is not true for all practical concerns. Or to put it differently: I can construct an instance which you won't be able to crack within the lifetime of our universe.

homomorphic encryption looks nice as theory, but there are no existing implementations.

There are libraries (just google for it), but I haven't seen an implementation that was used for a protection mechanism.