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@Shimo,
Thank you for posting the query.
It looks like Aspose.Slides does not provide a feature to modify the description properties of PDF output files. I logged the issue with ID SLIDESJAVA-38666 in our tracking system. Our development team will consider implementing this feature. You will be notified when this capability is added.
Please take a look at Aspose.PDF product for your purposes.
Because the tag indicates which api we use to product pdf!
@Shimo,
Our development team has investigated your requirements. Unfortunately, we are unable to fulfill your request due to security restrictions.
Documents: PowerPoint to PDF Conversion in Java