What you write about Acrobat is not true. Acrobat verifies signatures revision by revision to determine where changes have taken place (and why). It then "rolls up" the validation states into a single state in the UI. However, if you look in the Signature Panel, you will see all the individual states.
Leonard -----Original Message----- From: OscarP [mailto:opasc...@gmail.com] Sent: Friday, May 29, 2009 4:36 AM To: itext-questions@lists.sourceforge.net Subject: Re: [iText-questions] How can compare the content of two revision Hi, thanks for all the answers. As mkl said, I started this thread due to a problem between Adobe9 and iText. Adobe9 verifies the signature fields including the whole document, not just from revision to revision, whilst iText verifies signature fields from revision to revision. If I sign a document, edit it and sign it again, iText validates these signatures, but Adobe9 indicates that the first signature is not valid. What I need to know is how to compare two revisions of a PDF without bearing in mind the signatures, whether they are visible or not. Leonard Rosenthol-3 wrote: > > PDF/A-1 fully supports annotations, links and form fields - so you can't > simply rely on simple visual either. > > Leonard > > -----Original Message----- > From: mkl [mailto:m...@wir-sind-cool.org] > Sent: Tuesday, May 26, 2009 5:12 PM > To: itext-questions@lists.sourceforge.net > Subject: Re: [iText-questions] How can compare the content of two revision > > > > Mike Marchywka-2 wrote: >> >>> As this thread originated in one about digital signatures, I doubt that >>> is >>> what he needs. >> >> In my first post, I mentioned the opposite extreme of rendering all pages >> to BMP and doing a simple pixel subtract- this can be quite useful in >> some >> cases. >> > > Yes, when just checking for visual identity, that would be a way to go. If > the document is PDF/A that should suffice. Otherwise there may also be > some > dynamic components, though, the behaviour of which is not captured like > this. > > Regards, Michael. > -- > View this message in context: > http://www.nabble.com/How-can-compare-the-content-of-two-revision-tp23649348p23731451.html > Sent from the iText - General mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity professionals. > Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp as they present alongside digital heavyweights like > Barbarian > Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com > _______________________________________________ > iText-questions mailing list > iText-questions@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.1t3xt.com/docs/book.php > Check the site with examples before you ask questions: > http://www.1t3xt.info/examples/ > You can also search the keywords list: > http://1t3xt.info/tutorials/keywords/ > > ------------------------------------------------------------------------------ > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity professionals. > Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp as they present alongside digital heavyweights like > Barbarian > Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com > _______________________________________________ > iText-questions mailing list > iText-questions@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.1t3xt.com/docs/book.php > Check the site with examples before you ask questions: > http://www.1t3xt.info/examples/ > You can also search the keywords list: > http://1t3xt.info/tutorials/keywords/ > > -- View this message in context: http://www.nabble.com/How-can-compare-the-content-of-two-revision-tp23649348p23776308.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/ ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
