Occasionally I do software copy-protection dongle replacements or dongle emulators.
Like this ancient LPT dongle (newer dongles are almost like USB sticks):
In general, it is somewhat unlawful to break software protection, so I can do this only if these conditions are met:
These includes ancient MS-DOS and UNIX software. Software for exotic computer architectures (like MIPS, DEC Alpha, PowerPC) accepted as well.
Examples of my work you may find in my book: Reverse Engineering for Beginners.
Typical price is USD 300.