nobody can claim copyrights to a block in the public domain.
nobody can claim copyrights to a quilt layout using blocks in the public domain.
making minor changes to blocks in the public domain do not constitute a new design. they are known as derivatives and copyrights cannot be claimed. same goes for layouts using those blocks.
HOWEVER ...
even when a block and/or quilt layout is in the public domain, the "designer" absolutely does have copyrights - and all associated protection - to the instructions and illustrations in the patterns, books, magazines, etc they publish.
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