You have to remove the apps from the actual store, whether you purchased them via. a secondhand program or not. In the long run, it's all synced it iTunes. If I put stuff on my iPod thru an illegal website with copyright music, (Which I DON'T do and DO NOT reccomend!) directly from a website open in the Touch's web browser, the next time it syncs to my computer the music gets put on iTunes whether I like it or not. You actually have to go into iTunes and delete the apps. (Right click and click delete)
I presume that's what you were asking, but then again I didn't understand your question very well.