File size increases dramatically after digital signature with Acrobat X

I signed a PDF file using Acrobat X.
File size of unsigned document: 200 k
File size of signed document: 3200 k (more than ten times bigger)
Any idea?
BR
Harald

Finally I found the solution.
The file size increase is a result of the embedded information used for long-term signature validation.
If you do not need this feature, you can turn it off:
Preferences > Security > Advanced Preferences > Creation tab
disable "Include Signature’s Revocation"
Help page: http://help.adobe.com/en_US/acrobat/X/pro/using/WS934c23d7cc8877da1172e0811fde233c98-8000. html
BR
Harald

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