Is there a way to optimize a digitally-signed PDF?

Our HR department gets resumes from applicants and emails these resumes to school principals. They optimize these pdf's so that they are able to be emailed without going over the size limit of the users' email boxes. They are starting to get a lot of digitally signed pdf's and when they try to optimize them they are getting a message saying that digitally signed files cannot be reduced. These files end up being too large for emails. Is there any way around this?
Any help would be appreciated.
Thanks!

Not without invalidating the signature, you may make changes to the PDF and any change is a change.

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Is there a way to optimize a digitally-signed PDF?

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