Unable to copy the content of pdf and paste in doc or text pad any help

I have pdf’s docuemnt which is produced by GNU Ghostscript v7.06.. my question is i want to copy a content and paste in text or doc file. it is not happening. any help. and for more information i am using window xp, with service pack 2. for more information on pdf is, it has a fonts TTE … is any help on this. Thanks advance