pdf檔的要如何破解???

手上有一些pdf檔,因為要複製其內容....
但因為有文件保護,不能複製...希望那位大大可以幫幫我...

If the PDF file has a "user" password set (i.e. you have
to supply the password to open the file in Adobe Acrobat
Reader), APDFPR can decrypt it (removing the protection)
only if you know either "user" or "owner" password. The
user password itself can be recovered using brute-force
and dictionary attacks only (which are time-consuming);
if you're interested in such features, please look at
"professional" edition of APDFPR:

http://www.elcomsoft.com/apdfpr.html

之前好像有大大介紹過一個軟體
pdf2txt
可將pdf轉成txt檔，還有用adobe writer可以編輯pdf
我只知道這些
但我找不到下載點
如果說錯的話請大大原諒

[psac]

又回一次同樣問題!內找....
Advanced.PDF.Password.RecoveryPro.v2.10.21　　
http://dingxin.dns2go.com/cgi-bin/lb5000/leoboard.cgi

請問有
Advanced.PDF.Password.Recovery 1.43
的註冊碼嗎....
我在sndb都找不到也..
希望可以幫幫我....