Topic on Talk:The big list of third-party DRM on Steam
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Thanks for noticing that. This text was used by the games to show SecuROM error messages and isn't made by SecuROM itself; even the GOG.com versions still make them. I double-checked the Steam version of Deadly Shadows with Protection ID and the SecuROM Removal Tool and neither detected SecuROM.
I've added both games to Removed DRM with an explanation.