can't merge separate PDFs into a single PDF

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i receive following when attempting merge separate pdf files single pdf file in acrobat 8.1.2 using os 10.5.4 on imac:
at least 1 file in list requires password. combined file not secured. want continue?
i message file in list protected, , im prompted enter permissions password. dont know (the password have associated adobe doesnt work) or locate it.
this problem has cropped recently, , must send list of pdfs instead of single file.

did create pdf's? if not, looks has added security it.

if did, you've inadvertently added security 1 of them. you'll need find out 1 , remove security.


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