Entropy 1.5 for OSX is an archive-manager with extensive tools. The downloadable version is a trial that works for 15 days. In order to circumvent the protection, we look at the code responsible for displaying the license window:
====== B E G I N O F P R O C E D U R E ======
; Basic Block Input Regs: rax rdi - Killed Regs: rax rbx rsi rdi r12 r15
methImpl_LicenseWindowController_setupUI:
000000010002342e 55 push rbp
000000010002342f 4889E5 mov rbp, rsp
0000000100023432 4157 push r15
0000000100023434 4156 push r14
0000000100023436 4155 push r13
0000000100023438 4154 push r12
000000010002343a 53 push rbx
000000010002343b 50 push rax
000000010002343c 4989FF mov r15, rdi
000000010002343f 30C0 xor al, al
0000000100023441 E8E3F9FFFF call sub_100022e29
...
The last call triggers a subroutine sub_100022e29 which in turn calls two other subroutines, in order to determine whether the application is registered of not. This is the weakest point of entropy and we can skip over the code that is meant to display the window and nag about registration:
sub_100022e29: 0000000100022e29 55 push rbp ; XREF=0x10000ee75, 0x100023441, 0x10002381e 0000000100022e2a 4889E5 mov rbp, rsp 0000000100022e2d E8A4FBFFFF call sub_1000229d6 0000000100022e32 E87BFCFFFF call sub_100022ab2 0000000100022e37 88C1 mov cl, al 0000000100022e39 B802000000 mov eax, 0x2 0000000100022e3e 84C9 test cl, cl 0000000100022e40 E91A000000 jmp 0x100022E5F 0000000100022e45 90 nop 0000000100022e46 90 nop 0000000100022e47 488B358AC40400 mov rsi, qword [ds:objc_sel_intValue] ; @selector(intValue) 0000000100022e4e 4889C7 mov rdi, rax 0000000100022e51 FF1529430300 call qword [ds:imp___got__objc_msgSend] 0000000100022e57 85C0 test eax, eax 0000000100022e59 0F9EC0 setle al 0000000100022e5c 0FB6C0 movzx eax, al 0000000100022e5f 5D pop rbp ; XREF=0x100022e40 0000000100022e60 C3 ret
The jmp at 0x100022e40 and the succeeding nops make entropy ignore all licensing issues and proceed anyway. That is all that is required.