Adding marks to pdf file?

Miscellaneous Forums/General Discussion/Adding marks to pdf file?

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@Leadwerks: Thanks, but I mean drawing cirle with mouse in pdf file on screen, not on a physical document. So, I don't need a highlight pen.

@Mortiis: Thanks, it is useful to generate pdf file, but given a pdf file, how could I add a circle in pdf visually?

Any ideas?