Copyright law again - same but different?

[Patt Legg]

I have read most posts about National Geographic, etc., but here is my question. I know there have been artists who will copy old master paintings and sell as just that -- a similar copy of Rembrandt's painting, yadda yadda. Making sure they acknowledge the original.

Can I copy an old cover of say a 1935 McCalls magazine cover? They usually have ads of a product too, like Lux soap, certain coffees, etc. Couldn't I copy the magazine yet change the actual name to "Mc Caws" or something like that? I know there are reproduction metal signs out there of old products and collectors love them. What about a painting? Help please.

Thanks in advance.