Signing a PDF document converts it to a higher PDF Version

I am using Acrobate 9.3 Standard.  For my industry, we are required to keep our PDF files at Version 1.4 (Adobe 5.0).  However, when we digitally sign a document it forces a save and during that save process it converts the document to Version 1.6 (Adobe 7.0).  Down-converting back to 1.4 obviously invalidats the signature.
If there a way to force the digital signature signing save to keep the document at Version 1.4?
Thanks,
Muiron

The short answer is no.
In the Acrobat 5 (PDF 1.4) timeframe all you could do was create a digital signature using an Acrobat generated self-signed certificate. A5 had no concept of certificate chaining or revocation checking, which was introduced in A6 (PDF 1.5). Version 7 introduced time stamping, SHA-256 support, and OCSP revocation checking, and that's the current minimum.The older PDF standards (1.5 and earlier) don't support a signature created in A9.
Steve

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