You don't need hijack this to find SecuROM. And with most games, if you apply a slightly less than legal modification to the exe before you run the game, you will bypass the activation of SecuROM entirely.
If you want to uninstall SecuROM, it's actually a fairly easy process as detailed at the end of this:
http://bansama.com/b/spore/spore-gets-summoned-part-1/
The only files and registry entires you will have "difficulty" removing are directly linked to your activation keys. And that is the only reason the SecuROM uninstaller does not remove them. As they don't want you losing activations by accidentally deleting the information.
All the actual active parts of SecuROM, such as Paul.dll and so forth will be removed by the uninstaller (or can be deleted by yourself) once you have run the uninstaller without the need for third party software.
Thus, you can safely remove the active components of SecuROM and then leave the hidden files/registry entries alone (if you wish) as they will NOT harm your PC. And yes, I have tested this fairly extensively.