Comments on: pyPdf 1.8 – with PDF encryption! http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/ Just another WordPress weblog Tue, 31 Mar 2009 04:37:44 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Lionel http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/comment-page-1/#comment-100 Lionel Mon, 14 May 2007 12:40:40 +0000 http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/#comment-100 I have a document with pages in A4 format, and I want to merge them to get 2 pages on a A3 page. I played with mediaBox, cropBox, ... of page0 and merge page1 on it, no success, page1 is always ON TOP of page0 (I had also changed Boxes of page1, not good). Now my question : how do you use merging to put page0 on the left, page1 on the right of an A3 page? I have a document with pages in A4 format, and I want to merge
them to get 2 pages on a A3 page. I played with mediaBox,
cropBox, … of page0 and merge page1 on it, no success, page1 is always ON
TOP of page0 (I had also changed Boxes of page1, not good). Now my question :
how do you use merging to put page0 on the left, page1 on the right of an A3
page?

]]> By: BernieC http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/comment-page-1/#comment-99 BernieC Mon, 30 Apr 2007 12:54:12 +0000 http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/#comment-99 Many thx for the excellent work on PyPdf. I love it. A quick question, would it require much work to include set-functions on the documentInfo objects. FYI, I use pypdf to read in pdf-files from my academic literature, and to build an up-2-date db of everything I own on pdf, including a title, author, and summary. Unfortunately, not many researchers write metadata. So it would be nice if on first encounter with empty metadata fields I could enter them myself, instead of having to open every pdf and do it there. kind regards, Bernie. Many thx for the excellent work on PyPdf. I love it.
A quick question, would it require much work to include set-functions on the documentInfo objects. FYI, I use pypdf to read in pdf-files from my academic literature, and to build an up-2-date db of everything I own on pdf, including a title, author, and summary. Unfortunately, not many researchers write metadata. So it would be nice if on first encounter with empty metadata fields I could enter them myself, instead of having to open every pdf and do it there.

kind regards,
Bernie.

]]> By: samj http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/comment-page-1/#comment-98 samj Wed, 28 Feb 2007 12:41:05 +0000 http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/#comment-98 Just a note to say thanks for making PyPdf available - it works really well. Just a note to say thanks for making PyPdf available – it works really well.

]]> By: Sharad Popli http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/comment-page-1/#comment-97 Sharad Popli Fri, 23 Feb 2007 07:26:13 +0000 http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/#comment-97 Justin's right. Each call to the hash function consumes a minuscule amount of time and the iterations cause the time spent to increase. For ordinary, legitimate use, the user will barely notice. But for someone attempting a brute force attack, it increases the difficulty level significantly. And hopefully their frustration levels too... ;) Justin’s right. Each call to the hash function consumes a minuscule amount of time and the iterations cause the time spent to increase. For ordinary, legitimate use, the user will barely notice. But for someone attempting a brute force attack, it increases the difficulty level significantly. And hopefully their frustration levels too… ;)

]]> By: Justin http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/comment-page-1/#comment-96 Justin Fri, 15 Dec 2006 14:21:06 +0000 http://mathieu.fenniak.net/pypdf-18-with-pdf-encryption/#comment-96 Usually that kind of thing is done to make brute forcing keys harder.. WPA does a similar thing, but with 4096 rounds of hashing. Usually that kind of thing is done to make brute forcing keys harder.. WPA does a similar thing, but with 4096 rounds of hashing.

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