Thanks for the detailed description.
You may please share the document that you have created using Indesign CS6 along with the font created 'UniversLTStd-LightUltraCn'.
You can use Adobe send or upload it on share drive to share the file with us via private message.
We would like to check the same at our end and will update you for the same.
Akanchha -- I sent you a private message with the information requested.
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The issue is unfortunately very simple.
In order to edit text in a PDF file, two conditions must exist even if the font is already embedded within the PDF file itself:
(1) The font must be installed on the system on which the editing is to be done.
(2) The font must have the editable embedding privileges.
Unfortunately, the Univers LT font family only has preview and print font embedding privileges which is insufficient to allow Acrobat to allow editing of content formatted with that font. (Similar restrictions apply to using a font in a forms field!)
Note that the embedding privileges are not controlled by Adobe, but rather, by the original font creators. In this case, you really need to go back to InDesign, make the text edits there, and then recreate the PDF file.
Thanks for your response. Why would my Mac allow my to edit the same PDF but just my Win10 device gives me that error then?
I believe that there is a version of that font bundled with MacOS that does not restrict editing, i.e., it has editable embedding enabled. I am not near my Mac right now and as such cannot confirm that. But I can confirm the issue with the standard version of Univers LT family previously available from Adobe and currently available from other sources.