>>> securelink-plugin.xml
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Adds extra security to the LDM "play" and "download" urls by adding an encrypted validation code 
to the urls, locking the urls to the entry/userid/ip address/time generated, depending on the admin settings.

Normally, LDM play/download links are secure, in the sense that they maintain location secrecy and 
VB/LDM user access permissions in force when generated. However, they can be copied and 
pasted into emails, etc, and are not 'time limited'. In particular, if you give unregistered users 
access to LDM, then anyone can send the play/download urls to others and get access to the file without 
visiting your board.

Another use for this extra is to give certain userids/IP addresses access to files, while blocking them to 
everyone else.

After installing this extra, an LDM admin setting group is available to specify the following parameters:

- active/inactive
- encryption key
- url expiration time in minutes
- Userids to which the url is locked
- IP addresses to which the url is locked

Apart from the encryption key, all parameters can be set on a per-category as well as global basis

