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Drupal's default content locking strategy is optimistic, that is, two users may start to edit the same content and the one who is hitting the save button first wins the race, while the other is displayed a message stating this content has been modified by another user, changes cannot be saved. Depending on the number of editors in your organization this might not be an acceptable solution.

The Checkout module implements pessimistic locking, which means that content will be exclusively locked whenever a user starts editing it. The lock will be automatically released when the user submits the form or navigates away from the edit page.

Users may also permanently lock content, to prevent others from editing it. Content locks that have been "forgotten" can be automatically released after a configurable time span.

Drupal has a core upload module which is quite good. Quite, yet not perfect.

This module is actually two projects, a general playlist relationship API, and an audio_playlist.module which makes use of the API.

The roledelay module allows you to set a user role that new members are granted after a certain time period from registration.

Overview

Allows you to make documents for just about anything, pdf them, deliver or print them. It uses a technology called Latex. LaTeX is a high-quality typesetting system.It includes features designed for the production of technical and scientific documentation. LaTeX is the de facto standard for the communication and publication of scientific documents. In other words "It can make your documents look incredible". Want to look the most professional you can, then use Latex.