PDF Encryption

Hi All,
I am generating pdf files in rails.
Now i want to encrypt these files and also make them password protected.
I am using reportlab utility for this. But here it needs pdfencrypt module in it, i am not able to locate this folder to include in the import path of python.In fact it requires r1extra utility which contains this pdfencrypt package.
Any pointers for me??

Thanks
Arpit