Problems Copying PDF files?

[TheLyon32]

I have a cd of certifications tests and answer keys all in pdf files. I am having trouble making a back-up disc. I have tried CloneCD and BlindWrite. Whenever I attempt to open a copied file I get the error message "...is not a supported file type or has been damaged" (Acrobat). I also tried a pdf password remover program but it didn't detect any passwords on the files. Any help would be greatly appreciated.

I also tried to convert the pdf files to word documents but I wasnt successful with that either

[kklord]

The pdf file might be indeed damaged. Try cleaning the disk.

[imsmart]

seem they are damage..

[lordyosi]

yes it may be damaged

[anandp]

You can try the bad copy professional v3.80.

[0gbqf3v02]

Try extracting using programs like ISOBuster?

[elwill]

they r damaged

[Barbarossa]

have you considered the possibility that they might be damaged?

[TheLyon32]

After doing a little research I have determined that the issue is not damaged files it is hexalock copyright protection. I haven't found an answer yet but I will keep looking