contextualizing a book rather than banning it

I grew up reading Tintin books/comics, and loved them. I never read "Tintin in the Congo," though, currently the topic of news [perhaps it was not available in my leftie-leaning home town?]. This quote from a news article addresses something we discussed for LIS 2000 on the topic of censorship: contextualizing rather than banning.

"Remi later said he was embarrassed by the book, and some editions have had the more objectionable content removed. When an unaltered edition was brought out in Britain in 2005, it came wrapped with a warning and was written with a forward explaining the work's colonial context." [my emphasis]