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Licensing
A graph of simple function doesn't warrant copyright at all.
Public domainPublic domainfalsefalse
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Heptagon
Public domainPublic domainfalsefalse
This work has been released into the public domain by its author, Demmo. This applies worldwide. In some countries this may not be legally possible; if so: Demmo grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.