Multiple users, one library

c) you don't need to buy a second license, they allow you to run on a few machines with the one licence, cool huh?

so how do I do this thing, well its complicated and it's not... first thing I would do is make a backup of any existing libraries on your accounts.

you then need to decide where you are going to put the shared library, personally I'd advocate /Users/Shared, but it's entirely up to you, but wherever you put it, you will need to make sure that everyone has read/write permissions to the files, but more on that later.

so lets try this, you will need to use terminal.app to get this working so if you are not very technical, then please be aware that everything you will type will be case sensitive and that the orientation of any slashes \ or / will be very important:
1) choose one of your libraries to be the master library, this will be moved to the shared location to become your new shared library. We will actually be moving the whole folder not just the library in the folder.

in terminal.app, type the following followed by enter

pwd

this should return a path such as mine
/Users/stuwilson

cd "Library/Application Support"
pwd

this should return the path as (obv not stuwilson unless spookily you are also called stuwilson) :p
/Users/stuwilson/Library/Application Support

ok we are good to go:

cp "Delicious Library 2" /Users/Shared
cd /Users/Shared
sudo chown -R root:wheel "Delicious Library 2"
sudo chmod -R 777 "Delicious Library 2"

this has copied your library to the /Users/Shared folder, changed the owner and then added read/write permissions so that everyone on your machine can access it.

ok here the last bit, making the symbolic link so that it hangs together:
for each user that needs access to the shared library, login to that user, and open terminal.app

*******************************************
PLEASE NOTE, this will DESTROY any existing Library for that user, so if you have data EXPORT IT FIRST, then close Delicious Library, or it wont work
*******************************************
type the following very carefully (this is all on one line):

ln -sF "/Users/Shared/Delicious Library 2/Delicious Library Items.deliciouslibrary2" "Library/Application Support/Delicious Library 2/Delicious Library Items.deliciouslibrary2"

And that's it, however you may want to check thats it's worked first...

type the following:

file "Library/Application Support/Delicious Library 2/Delicious Library Items.deliciouslibrary2"

will return
Delicious Library Items.deliciouslibrary2: SQLite 3.x database

but if it returns

...broken symbolic link to Delicious Library 2/Delicious Library Items.deliciouslibrary2

then its all gone pear-shaped.

DISCLAIMER: If you lose your data with this, neither myself nor any person living or dead except you are at fault, srsly, this isn't hard to do but can be prone to errors for Unix n00bs.

make backups before you do any of this, if you don't and it goes pear-shaped, well sorry.

Restoring any backups is simply a matter of copying the original folders back to the Library/Application Support folder.