On 11/19/05 8:57 AM, "David Dyer-Bennet" <dd-b@xxxxxxxx> wrote: > Gregory Fraser <Gregory.Fraser@xxxxxxxxxxx> writes: > >> Per Winzip 8.1's help file >> >> 'TAR stands for "Tape ARchive". The TAR format does not provide >> compression; it is used only to group files. >> >> Its mostly used in the Linux world. I used to have an un-user >> friendly program to extract .TAR files but I can't remember where I >> found it or what it was called. However, since its in .TAR format I >> really doubt it would work in Windows. > > Winzip will read and extract files from tar files, actually. > > And the format predates linux considerably; it's a standard Unix > format (linux being one of the current threads of the Unix family). It is true that WinZip can extract .TAR files as well as many others. But isn't it also true that if a password or key has been assigned you can only extract the contents of the folder if you provide that password ? I remember three years ago an article about how to create "encryption" on specific folders in Windows using WinZip. When grouping files together under one folder this folder can be compressed with a password assign that would require anyone trying to open the folder to have to provide the password. On another note I use Adobe Acrobat regularly and will enforce what has been said here about the security features in the PDF file. The file has to be created by a full version of Acrobat. The viewer, on the other hand, only needs to have Acrobat's Reader which is free. Once he tries to open the file he will be prompted for the password. After the file is closed if he wants to open it again he has to provide the same password. Acrobat offers two levels of password security: one password for opening the file and reading it, and another password for editing. They can be the same or different passwords. One can easily assign one password and provide it to the client for viewing images but keep the editing password so that the client or another individual don't have access to editing the files (in this case images). Acrobat supports images of any size although using large images may cause to behave slower than usual. Image files can be imported as either JPEG or TIFF. Best regards, Joseph --- Dr. Joseph Chamberlain Oral and Maxillofacial Surgery
