I would like to create an style-unified collection of cartographic symbols - mainly for use with free SW like QGIS.

I would like to use (probably modify) some already prepared ones from various CC0 licensed sources like SJJB icons or Maki icons but also some from OpenClipart Library

Am I right if I think that I can freely mix and modify distributed content without need to cite sources for particular icons? I plan to keep the CC0 1.0 Universal (CC0 1.0) Public Domain Dedication license even for my original additional icons to not to restrict use in any way and I plan to add something like "Some icons are from source 1), some from source 2)" etc. - just to be fair.

Is it OK?



If they are licensed under CC0 it is impossible to infringe their copyright.

You have the same rights as if they were public domain due to age.

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