Among other things, Sebastian H. saw fit to write:

>>>The important thing is to find if Escher's work is still under
>>>copyright, or if it has passed into the public domain.
>> 
>>   He died in 1972, so the answer is no.
> 
> Ahem.
> What exactly means no here?
> Is it not under Copyright or not passed into public domain?

I guess the exact copyright term depends on the country and on the date of
creation. From Wikipedia:

"The expiration time differs from country to country, but according to the
Berne Convention the minimum time is the lifetime of the author plus 50
years. In the Netherlands the term is 70 years after the death of the
author."

So, I'd say We'll have to wait some 35 years more to be sure Escher's works
are public domain...

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