Doc size with digital signature

i've got 2 questions, please help:
1) why do .pdfs with digital signatures have such large file size? how can i reduce the size?
2) why do .pdfs with digital signature become text non-searchable?
thnx
brg

actually the same signature size isn't such a problem when using Adobe software, but when using pdfCreator, the size increases... pls don't give me lectures on using another software, i need A5 and Adobe doesn't provide it...
so i guess it's the problem within that other pdf maker...
why i need to pdf print the file? one reason is i can print it ( otherwise signatures don' show, protection i guess), the other reason to protect the signatures that for that specific reason only need to be seen.
thnx.
brg

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