What are some alternatives?
When comparing Themida and VMProtect, you can also consider the following products
UPX - UPX (Ultimate Packer for eXecutables) achieves an excellent compression ratio and offers very fast...
PELock - Software copy protection against reverse engineering with anti-cracking & anti-debugging techniques. Software license key system with time trial options.
Alienyze - Alienyze is a software packer and protection solution for windows executable files. Alienyze allows developers to easily protect their software against cracking and reverse engineering.
ExEinfo PE - Packer, compressor detector / unpack info / internal exe tools.
Free UPX - Graphical interface for the UPX packer, UPX 3.91w, UPX 3.92w, UPX 3.93w, UPX 3.94w, Ultimate Packer for eXecutables, EXE packer
LockBytes - LockBytes is a Lightweight DRM (Digital Rights Management) solution for licencing Windows executable files.