Thanks for the kind reply, Nirth. I'll look into the suggestions you make me.
The use is only for surfing (as "which requirements has this game", or "that GamersGate title has DRM?"), not to play or download.
The problem with the public library is that many children came to play on PCs (making a lot of racket) and they solved the issue disabling too many websites (as Mobygames, which for me was THE reference for information on old games).
Ask permission is not an option because officials who work here have no idea about computers (indeed often turn to me if any user has any questions, and I'm present). The amendment has been made by the technical services of the municipality with some predefined exclusion list (I suppose).
Lucky they were not aware of the existence of GOG, or my participation in this forum have been reduced to virtually zero. ;)