Re: encrypting a pdf
Re: encrypting a pdf
- Subject: Re: encrypting a pdf
- From: Jim Mooney <email@hidden>
- Date: Sat, 21 Oct 2006 13:01:22 -0400
Actually there is a built in scheme that I believe works in Quartz
which I looked at through someone's post. Quartz allows you to create
a CGPDFContent and during the creation, will encrypt it into one that
Acrobat accepts, MD5 or some other one. All you need to do is give it
a password and the encryption takes place. At least that is how I read
it today.....Give me a couple of hours to test it. Seems like it is
straight forward.
this is something that takes place in the app, not some other outside
mechinism and the hopeful result will not require providing my own
encryption method, but one that Adobe already supports.
TBC
On Friday, October 20, 2006, at 02:21 PM, Jordan Evans wrote:
If you don't mind developing it, it isn't that hard. I did it, but I
haven't created an interface for it.
Encrypt:
1. Copy your first PDF into an NSMutableData object.
2. Encrypt it.
3. Write it out to the single file that will be a combination of all
PDF's.
4. Write location and size of PDF, as well as encryption info to file.
5. Repeat for all PDF's.
Decrypt:
1. Using your key, find the location, size and encryption info.
2. Decrypt.
3. Repeat for each PDF file.
As long as you have your encryption thought through, developing this
really doesn't take long to do.
I wouldn't rely on others encryption. If you can't understand it, how
do you know for sure it really is doing what it's saying? That's why
I created my own.
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