DRM-Enabled pdf files

[Philip Jones]

Hi,
I made annotations in a pdf file and then saved it using Save As but have been unable to retriieve the annotations, only the highlighted text segments they refer to.
In seeking an answer in the Okulat Handbook I noted that saving annotations may not be possible in a DRM-enabled pdf. The pdf file I have does not say it is DRM-enabled and I have been unable to to find how to identify if it is in fact DRM-enabled.
I was wondering if there is any visible way that Okular identifies DRM enablement.
My apologies if I have missed an entry but all my searches for DRM-enabled generated a 'not found'.
Best regards
Philip Jones

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